Additional Problematica from Southwest Japan

' Jiro Katto '

(Ｄｅｐａｒtｍｅｎt ｏｆ Ｇｅｏｌｏｇｙ, Ｆａｃｕlりｏｆ Ａｒtｓ ａｎｄ Ｓｃｉｅｎｃｅｓ

Ｋｏｃｆｉｉ ＵｎtＴｏｅｒｓiり, Ｋｏｃｈｉ， Ｊａｐａｎ)

Introduction and Acknowledgments

The tip area of the Kii Peninsula, Wakayama Prefecture and the coastalregion of eastern and south Kochi Prefecture, Shikoku, are wellknown for their yield of Problematical fossils besides others of known systematic position. From the former area, the writer has published (see Bibliography) on the problematical fossils,discriminating from that area many different kinds. Yet there remain others stillwaiting to be described. In the present articlesome Problematica from the Kii Peninsula, Wakayama Prefecture, and from Kochi Prefecture, Shikoku, will be described. These Problematica are mostly additional to previous records, and comprise : ＼ ＰｅｃtｉｎａｒiafeiienｓiｓKatto,n. sp. ２.ＳａｌｍａｃｉｎｏｉｄｅａｋｕｓhimotｏｅｎｓiｓKatto, n. gen. n. sp. 3，Ｎｅｒeitｅsｄｒ. ｍｕｒｏtｏｅｎｓiｓKatto 4. ＴｏｓａｌｏｒbiｓJtａttｏｉHataiand Kotaka 5.Υθs�θΓ＆∫sp.indet. 6.1sｃｈｎｏｃｈttｏｎtａｎＯｉａＭｅれsiｓｎ. sp. 7.Ｚｏ卯hｙｃｕｚsp. indet. Besides the ones mentioned above there remain other Problematica stillwaiting to be described, and some of these are expected to be treated at another opportunity. The Pro- blematica described in this articleare in the collectionof the writer. At this place the writer expresses his thanks to Dr. Kotora Hatai, Director of the Saito Ho-on Kai Museum of Natural History in Sendai, for his guidance and reading of the manuscript.

Description of the Problematica

Family Amphictenidae Malgren, 1867

Genus Ｐｅｒ.tｉｎａｒｉａLamarck,1818

“Tube straight or slightly curved, composed of sand grains or other material cemented together, nearly cylindrical, but somewhat tapering and open at both ends"(marine). Perm.-Rec. (Howell, 1962, p. 163). The tubes of the genus PectinαΓiaare stated to range from the Miocene to Recent and to be cosmopolitan in distribution (Howell, 1962).

Contribution from the Department of Geology, Ｎ０.68 (Res. Repts. Kochi Univ. ) 18 Res. Kochi Univ Vol. Nat. Sci. No. 2

PｅｃtｉｎａｒiafettｅｎsisKattp, n. sp

PI. I, fig. 1

Z:ＶｓｃｒiMionl －Tubes nearly straight, only slight!ｙ curved, tapering,open at :both ends, composed of cemented sand grains of fine size； measuring a little more than 38.5 mm in length (terminal part of tube embedded in matrix), about ７ mm at broadest part of tube, but narrowing t0 4.５ mm near part covered by matrix. Tube originally circular in cross- section, but somewhat deformed during burial or subsequent fossilization； tube often broken longitudinally, almost parallel with surface of bedding plane. LiOcaliりａｎｄかｒｍａtｉｏｎ '■ -Nakahirami, Kushimoto-cho, near the tip of the Kii Peninsula,

Wakayama Prefecture. Tako Formation, Miocene. ＾ｐ.ｍｆｉｒhｓi:-Compared with Ｐｅｄｉｎａｒiafeoｒｅｎt(Malgren) illustrated by Okada and Iizuka

(1949, p. 1342, fig. 3804), a Recent species of Japan, the fossil species is of similar length, but is broader, thus making the tube appear shorter. The tube is apparently thicker than the Recent form. The fossil tubes were originally circular in profile, but during fossilization and to the deposited sediments, almost a11 0f them were more or less deformed and often broken longitudinally. Almost all of the tubes were found in ａ position almost parallel with the surface of the bedding plane though a few were observed to be in a position slightly oblique to the bedding plane. The empty tubes o? Ｐｅｃtｉｎａｒiafeoｒｅｎt(Malgren) are often found strewn on the sand beaches of Sendai Bay and have also been observed on the beaches of the Izu Peninsula,

Shizuoka Prefecture. The tubes of Ｐｅｃｌｉｎａｒia koｒｅｎｉ(Malgren)are often found broken because of their thin shell 0r cracked longitudinally due to drying. The empty tubes may be cracked or crushed

longitudinally or with only ａ part of the dried tube destroyed. However, in shallow calm water the empty tubes of PectinaΓz･a are, sometimes found in well preserved condition and above the strand line they are also sometimes found well preserved. The worms of Ｐｅｃｌｉｎａｒiaｓｅnerally live in shallow water where the tubes are partly em- bedded obliquely in the sandy sea bottom The tubes according to Young (1949, p. 218), “consist of a firm tube of closely adherent sand grains. ａｂｏ叫an inch and ａ half long, and wider at one end than the other”. The size of the sand grains making the tube are“selected by the worm and fitted together so that the tube is almost as smooth externally as well

as internally. Although fragile and easily crushed, it is firmly built and may long persist after death of the animal”.

FamilySerpulidae Burmeister, 1837 .

GenusSahnaci･ｎｏｉｄｅａKatto, n. gen.

Tubes narrow, irregular, cylindrical, long and of ｎｅχuous tubuloid structure Ｇｅれｏ防抑:－Ｓａｌｍａｃｉｎｏｉｄｅａｆｅｕｓhimotｏｅｎｓjｓ Katto, n. sp.

Sａｌｍａｃｉｎｏｉｄｅａｌこｕｓhimotｏｅｎｓiis Katto, n, sp

PI. I, fig. 2 Additional Problematica from Southwest J 19

Ｄｅｓｃｒゆ

measuring up to about １ cm in length and 0.５ mm in diameter ； surface smooth but with obscure concentric growth lines, rounded in cross-section ； tubes crossing one another at places. Structures rounded in cross-section, but frequently somewhat flattened by subsequent

pressure during fossilization and sometimes narrow by lateral squeezing due to pressure by

burial. No external sculpture observed. Tubes narrowing at places due to pinching.

Ｒｐｍａｒfeｓ: － The present specimens show some resemblance with the tubes of Ｓａｌｍａｃｉｎａ

ｄｙＵｅｒi(Huxley) collected from bamboo poles drifted to the beach at Nobiru in Matsushima

Bay north of Sendai City, Miyagi Prefecture. The tubes of Ｓａｌｍａｃｉｎａｄｙ％tｅｒi･ａてｔtｒｏｍ

1-2.5 mm in width with concentric lines as the sculpture and are irregular and flexuous in extension, overlapping one another at places.

The fossil tubes resemble the Recent S�macina from Matsushima Bay in general mor-

phological characters but are more irregularly developed with smooth surface and are

considered be the tubes built by some unknown Polychaete worm thought to be similar to

the polychaete genus ^ａｌｍａｃｉｎａ.

L,ｏｃａｌｉtｙ: － Eda, Kushimoto-cho, Wakayama Prefecture.

＼ｎｒｍａｉｉｏｎ: － Muro Group (e-bed) at Eda in Kushimoto-cho, Wakayama Prefecture.

Family Nereidae Savigny, 1820

Genus ＮｅｒｅｔtｅｓMacLeay, 1839

Ncｒｅtleｓ ｃ１，ＴｎｕｒｏtｏｅｎsisKatto, 1960

PI. n , figs. 1, 2.

1960 NeｒeitｅｓｍｕｒｏtｏｅｉぶｓKatto, Sci. Rep., Tohoku Univ., Ser. 2, Geol.Spec. Vol. No.

4 (Hanzawa Memorial Volume), p. 326, pi. 35, figs. 3, 14, 15.

＼ｑis Ｎｅｒｅttｅｓｒｎｕｒｏ£ｏｅｎｓiｓKatto, Res. Repts. Kochi Univ., Vol. 24, No. 6, p. 3.

Ｔ-ｙｔｅｌｏｃａｌｉりａｎｄｆｏｒｍａtｉｏｎ‘. －Eocene Muroto Formation. Hanezaki, Muroto City, Kochi

Prefecture, Shikoku, Japan.

Ｒｅｒｎａｒfeｓ: － Five specimens were observed. All are parallel with the bedding plane. These

problematica are all from the area of Sukumo City, Kochi Prefecture. The five specimens

representing trails of the named sea worm are all eroded and weathered and therefore the

details as to the nature of the segments can hardly be seen. However, the width of the

specimens, apparent segments and general shape all refer the specimens to the named

species with some doubt.

IｘｉｃａｌｉりａｎｄｆｏＴｍａｉｉｏｎ '■－ Nagasaki-hana, Kozukushi-cho, Sukumo City, Kochi Prefecture.

Paleogene.

Genus Ｔｏｓ�ｏｒbiｓKatto, 1960

1960Toｓａｌｏｒbis Katto, Sci. Rep., Tohoku Univ･, Ser. 2, Spec. Vol. Ｎ０. 4 (Hanzawa

Memorial Volume), p. 326 (Genotype:－Ｔｎｓａｌｏｒbiｓ ｈａｎｚａｖｕａｉＫａno, I960, Op. cit.,

p. 327, pi. 34バig.フ, pi. 35, figs. 8, 10). 20 Res. Rep. Kochi Univ., Vol. 25 Nat. Sci.、No. 2.

Υosalorbi‘s kattoi Hatai and Kotaka, 1961

PI，Ⅲ, figs. 1, 2, 3； PI.Ⅳ, figs. 1, 2, 3, 4

1961Υosalorbis kattoi Hatai and Kotaka, Trans. Proc. Paleont. Soc. Japan, No. 43, p. 124-126, pi. 17.

RemaΓｈ:- Abundant nearly straight to variously curved cylindrical tubes parallel to subparallel with the bedding plane of the fine grained sandstone in which they occur are in the present collection. The tubular structures cross-one another and occur in groups parallel to subparallel with the bedding plane. None preserve the original external sculpture

or structures but are vermiform in shape. Two specimens preserve in part the concentric

ridges (segments) which are thread-like. The tubular specimens measure up t０５ mm in diameter.

The present specimens coincide with the ones described by Hatai and Kotaka (1961, Op. cit.) from the sandstone of the Miocene Kanayama Formation cropping out near the Seto Marine Biological Station of the Kyoto University at Shirahama in Wakayama Prefecture. The specimens at hand occur crowded both horizontally and vertically in the fine grained sandstone of the Tako Formation exposed at Nakahirami in Kushimoto-cho, Wakayama Prefecture, and are considered to be identical with the named species. The present specimens show the same mode of occurrence as the type material described by Hatai and Kotaka (1961).

The present record is the second for the named species.

Ｌｏｃａｌｉりａｎｄｆｏｒｍａtion1 －Nakahirami, Kushimoto-cho, Wakayama Prefecture. Miocene. The Muro Group （e bed) at Eda, Kushimoto-cho, Wakayama Prefecture. Oligocene.

TｏｓａＺｏｒbiｓ ｓｏ indet｡ PI. V, figs 1，｡2.

Ｒｅｍａｒkｓ: － Many short (broken) tubes measuring about ｌ mm in diameter and up t０１ cm in length occur crowded from the surface to ａ depth of about ２ cm in the fine grained sandstone in which they occur.

The present specimens occur as crowded, overlapping one another at places, horizontal to subhorizontal tubular structures that do not retain the original surface structures except for faint segment-like appendages.

The present specimens appear to be young forms of ＴｏｓａｌｏｒbiｓkattｒiiHatai and Kotaka (Op. cit.), but are held distinct because their state of preservation is not so good.

ｈｏｃａｌｉり。ｉｄｆｏｒmali･∂,z: －Nakahirami, Kushimoto-cho, Wakayama Prefecture. Tako For- mation. ，

Pellets Possibly of Ｉｓｃｈｎｏｃｈｉtｏ几

IｓcFｗiocIiitoJi£ａｎｏｓalこｉｅｎｓiｓn. sp.

PI. VI, fig. 1.

Numerous, small, short, 1.5-3 mm in length rod shaped, straight or curved, bulby in Additional Problematica from Southwest 21 part, about 0.５ mm in diameter, flattened in part by subsequent ｐ ressi】reowing to coverir】g sediments probably during burial. Surface apparently smooth (except where eroded) , irregulary arranged on surface of bedding

plane ･of fine grained sandstone.･ Remarks : － These abundant, small, dark colored pellets cover the surface of the grayish

fine-grained sandstone. All are more or less eroded as the surface of the sandstone was exposed. Pinching of the

terminal parts was not observed except only in ａ few cases and the majority seem to have their terminal parts more or less abrupt･ The pellets are almost all curved in one direction and straight to sigmoidal ones although

present, were rare. The fossil pellets show similarity with the pellets of Iｓｃｈｎｏｃｈｉtｏｎ IhSowerby described and illustrated by Band el (1974) but differ therefrom in the smaller diameter. The pellets of ＢａｌａｎｕｓａｍａｒｙlliｓDarwin figured by Arakawa (1971, p. 236, text-fig. 4 H) somewhat resemble the fossil specimens under consideration, but differ in details such as in

the size and shape･ From the intimate resemblance with the pellets of IｓcJｘｎｏｃｈｉtｏｎmentioned above and also from the difference, the present fossil pellets are here referred to and named Ｉｓｃｈｎｎｃｈｉtｏｎ

ｔａｎｏｓａｋｉｅｎｓiｓ ｎ.Sp･ Locality : －Tanosaki near Kushimoto-cho, χVakayama Prefecture. Tako Formation.

Miocene.

Genus Ｚｏｏｐｈｙｃｏ％Massalongo ， 1855

ＧｅｎｏｌＮｐｅ；－ＦｕｃｏｉｄｅsｂｒｉａｎtｅｕsVilla, 1844 “Variously shaped Spreiten structures with thin tube and large but variable radius of curvature ； without strict separation of legs and vertex (thus unlike RhtｚｏｃｏｒａｌＨｕｍ). Spreite comprise thin slab of varied outline in part screwshaped”. (Perhaps made by worms-

all forms are feeding burrows). (Hantzschel, 1962).

Zｏｏ£>h"yｃｏｓsp. indet.

PI. V、fig. 3.

1968 Bischoff, Jour. Pa】eont., vol. 42, no. 6, p. 1439-1443, pi. 179, 180.

1968 Plicka, Jour. Paleont., vol. 42, no. 2, p. 836-849, 2 pis., 1 1 tｅχt-figs. 1969 Plicka, N. Z. Jour. Geol. Geophys., vol. 12, no. 2, p. 551-573, 18 figs. 1969 Webby, Jour. Geol. Geophys., vol. 12, p. 208-214, 3 figs. 1970 Frey, Univ Kansas Paleont. Contri., Art. 53, p. 5-41, 5 figs., 4 tables, 10 pis. 1971 Chamberlain, Jour. Paleont., vol. 45, no. 2, p. 212-246, pi. 29-32, 8 text-figs. 1971 Tanaka, Rep. Geol. Survey Japan, p. 1―31, 11 pis., 1 table.

1972 Osgood and Szmuc, Bull. American Paleont., vol. 62, no. 271, p. 5-22, 2 pis. 1973 Bradley, Paleogr. Paleoclimat. Paleoecol., vol. 13, p. 103 ―128. 1974 Kansha, Jap. Jour. Geol. Geogr., vol. 80， no. 8, p. 381-382. 22 Res. Rep･

Ｒｅｍａｒfeｓ: － The specimen here referred t0 the genus Zoophycos is represented by only about half part of the original, being represented by probably less than two-thirds of the original imprint. It shows ridges curving outwards from ａ common center. The ridges are

low, broadly rounded, separated from one another by shallow grooves, both ridges and grooves extend outwards in curved arrangement from ａ common center. Although not ａ complete specimen, the present ones coincide well with the figures given by Plicka (1968. pi. 107), Tanaka (1961, pi. 10, fig. 4), and others given in the synonymic

list above. The tubular spreiten curve concentrically outwards from ａ common axis or center. Ｚｏｏｐｈｙｃｏｓis suggested to be the burrow of ａ polychaete annelid by Bischoff (1968, p.

1441) similar probably to Ｐｏｌｙｄｏｒａ.Webby (1969, p. 210) states that Zoophycos is“inter- preted as representing a large feeding burrow of ａ worm-like animal produced by the systematic helicoid spiral mining of ｍｕd”. －

The present record is the third one from Japan, the first being by Tanaka (1971), who recorded Ｚｏｏｐｈｙｃｏｉｉｒom the Upper Cretaceous of Hokkaido, and the present record is the third ； itis from the Upper Cretaceous Arioka Formation exposed at Kunimi, Naka- mura City, Kochi Prefecture. Many opinions have been expressed concerning the nature of Ｚｏｏｔhｖｃｏｓby the authors mentioned above, but there seem to be no discussions with regard to the long geological

range and wide geographical distribution. There seems to be no marine worm known to

have such ａ long range as from the Devonian to into the Tertiary according to Hantszchel

(1962, p. 208), except probably the problematical F�eodictyon which ranges from the

Ordovician into the Tertiary according to Hantszchel (1962, p.208). The very long geological range and wide geographical distribution suggests thａｌ Ｚｏｏｐｈｙｃｏ％was ａ special type of marine worm that probably lived in an environment not associated with other kinds of marine fauna or flora except for abundant Ｉｎｏｃｅｒａｍｕｓfaallicｕｓin the Arioka Formation.

It is thought that the worm responsible for making Ｚｏｏｐｈｙｃｏｉdevoured the young （5f the marine benthonic and planktonic organisms that came near to the reach of the spreiten. Thereby the adult forms of the other marine organisms failed t0 live in the same environ-

ment with Ｚｏｏｌ>h"iicoｓ.Thisis similar to the case of the marine worm described by Hatai (1951).

The long spreite served for obtaining food or capturing the food that came within its reach ； the food was probably the young or immature forms. （jf benthonic, planktonic or nectonic life that came within reach of the long spreite;

The particular environment and non-association with other kinds of marine life may help in explaining the long geological range of Ｚｏｏｐｈｙｃｏｔ.Thislong geological range served to give ample time for the worm to become distributed universally.

The long geological range is similar to the case oｉ Ｐａｌａｅｏｄｉｃtｖｏｎ(Hantzschel,1962, p. 208), a problematical fossil 0f long geological range and wide geographical distribution, but of unknown origin. ｈｏｃallりａｎｄｆｏｒｍａtｉｏｎ: －Kunimi, Nakamura City, Kochi Prefecture. Upper Cretaceous Arioka Formation. Additional Problematica from Southwest ｎ (J. Katto) 25

Bibliography

Arakawa, Ｋ･ Ｙ･, 1968-Studies on the Molluscan Faeces (Ⅲ). Seto Marine Biol. Lab. Publ, vol. 16, no. 2, p. 127-139, 1 text fig。 pis. 16-17. Arakawa, K. Ｙ･，1970―Scatological studies of the Bivalvia (MoUusca). Advanc. Mem. Biol., vol. 8, p. 307-436, 30 figs･，5 pis. Arakawa, K. Ｙ･，197 1 ―Studies on the Faecal Pellets of Marine Invertebrates (Excluding Molluscs) 1. Publ. Seto Mar. Biol. Sta., vol. 19, no. 4, p. 231-241. Bandel, K･, 1974-Faecal Pellets of Amphineura and Prosobranchia (MoUusca) from the Caribbean Coast of Columbia, South America. Senkenbergiana Marit., vol. 6, no. 1, p. 1-31, 14 text-figs. Bischoff, B., 1968 ―Zoophycos, Ａ Polychaete Annelid. Eocene of Greece. Jour. Paleont., vol. 42, no. 6, p. 1439- 1443, pi. 179-180. Bradley, J･, 1973 ―Zoophycos and Umbelluia (Pennatulacea) ; Their Synthesis and Identity. Paleogeogr. Paleoclimat. Paleoecol., vol. 13, p. 103-128. Chamberlain, C. Kent, 1973―Morphology and Ethology of Trace Fossils from the Ouchita Moun･ tains, Southeast Oklahoma. Jour. Paleont., vol. 45, no. 2, p. 21-246, pi. 29-32, 8 text- figs･ Frey, R. W., 1970-Trace Fossils of Fort Hays Limestone Member of Niobrara Chalk (Upper Cretaceous), West-Central Kansas. Univ. Kansas Paleont. Contr., Art. 53 (Cretaceous 2)， p｡ 5-41, 5 ngS･， 4 tables. 10 pis. and Howard J. D. 1970―Comparison of Upper Cretaceous Ichnofaunas from si】iceoussandstones and chalk, Western Interior Region, U. S. A・i □1Trace Fossils, Geol. Jour. Spec. Issue, no. 3, p. 161, fig. 3d. Hantzschel, W., 1962-Problematica in Treatise of Invertebrate Paleontology, Geol. Soc. America and Univ. Kansas Press, p. 208. Hatai, K., 1951-A Problematical Fossil from Yamagata. Short Papers, Inst. Geol. Paleont., Tohoku Univ., no. 3, p. 41-45, 1 pi. Hatai K., and.Kotaka, T., 1961-A Miocene Problematica from Wakayama Prefecture. Trans. Proc. Paleont. Soc. Japan, N. S., no. 43, p. 124-126, pi. 17. Howell, B. F., 1962-Worms in Hantzschel, Treatise on Invertebrate Paleontology, Part w. Worms, Geol. Soc. America and Univ. Kansas Press, p. 163. Kansha, Y. 1974-Ichnofossil Z。ophyc。j from the Arita Formation at Yuasa-cho, Wakayama Prefecture, Japan. Jap. Jour. Geol. Geogr。vol. 80, no. 8, p. 381-382, 2 figs･ Katto, J., i960-Some Problematica from the Socailed Mesozoic Strata of the Southern Part of Shikoku, Japan. Sci. Rep., Tohoku Univ., Ser. 2, Geol., Spec. Vol. 4 (Hanzawa Memorial Volume), p. 323-334, 2 pis. , 1964-Some Sedimentary Structures and Prob】ematica from the Shimanto Terrain、 Kochi Prefecture,f*_。4.､｡。 Ｔ､､､､､､一 Ｄ。。Ｄ。ｒ､ぞe ｒ.､βｈ;Japan. Res. Repts. Kochi Univ.,TIniv vnl １１ Nat Scivol. 13, Nat. Sci. no. 6,fi p.D. 45-56,4S-56 8

pis 1973-Trace Fossils from the Shimanto Terrain, southern districtof Shikoku. 1 Atlas of Japanese Fossils, 2 pis., 7 figs., 1 table. 1973-Problematica and Sedimentary Structures ol’Tosa. Geol. News, Geol. Surv. Japan, no. 231, p. 58-65, 31 figs, (in Japanese). , 1974-A Pellet-cord from the Cenozoic (Miocene) of Higashi-Muro-gun, Wakayama ㎜㎜㎜㎜ ＝ ・ －－ －f ｡ /N゛ 4 /｀i._j Prefecture, Southwest Japan. Res. Repts. Kochi Univ., vol. 23, Nat. Sci., no. 1, Contr n０. 57， p. 1-7, 1 ng･，1 pi. 1974-A Fossil Tubular Structure from Wakayama Prefecture, Southwest Japan. Ibid. Nat. Sci. no. 3, Contr. no. 58, p. 9-12, 1 fig･. 1 pi. 1974-:Some Spiral Structures from Wakayama Prefecture, Japan. Ibid., Nat. Sci. no. 3 Contr. no. 59. d. 17-20, 2 figs. ww== S〃 ● , 1974-A Fossil Branching Structure from the Cenozoic Deposits of Wakayama Ｐrｅ･ fecture, Japan. Ibid., Nat. Sci. no. 4, Contr. no. 60, p. 17-20, 2 figs. , 1974-Some Tubu】ar and Rod Structures from the Cenozo ic (Miocene) Rocks of the Kii Peninsula, 一一一一- 皿－ 八● ４ニ /｀･ 』Wakayama Prefecture, Southwest Japan. Ibid., Nat. Sci., no. 15, Contr. no. 61, p. 115-121, 1 table, 1 pi. 24 Res. Rep. Kochi Univ., Vol. 25

、1975-Some Miocene Marine Fossils from the Kii Peninsula Wakayama Prefecture, Japan. Ibid., vol. 24, Nat. ScL, no. 6, Contr. no. 65 p. 1-9, 1 pi. , Masuda, K. and Sako, Y., 1976-A note on the sｏ･calledUpper Muro Group Wakayama Prefecture. Ibid, vol. 24, Nat. Sci., no∠15 Contr. no. 66, p. 133-142, 4 pis. Kornicker, L. S., 1962-Evolutionary Trends among moUusk, Fecal Pellets. Jour. Paleont., vol. 36, p. 829-834, 3 figs･ Moore, H. B., 1931-The Systematic Value of ａ Study of Molluscan Faeces. Proc. Malacol. Soc, vol. 19, p. 281-290, pi. 30-33. Okada, S., and Iizuka, K., 1949-Illustrated Encyclopedia of the Fauna of Japan. Hokuryukan Co. Ltd., Revised Edition, refer to p. 1342. Osgood, R. G. Jr., and Ｅ. Szmuc, 1972-The Trace Fossil Zoophycos as an Indicator of Water Depth. Bull. American Paleont., vol. 62, no. 271, p. 5-22, 2 pis. Plicka, M., 1968 ―Zoophycos and ａ Proposed Classification of ･Sabellid χVorms. Jour. Paleont. vol. 42, no. 3, p. 836-849, 2 pis., 11 text･figs. , 1969-Methods for the Study of“Zoophycos" and Similar Fossils. N. Z. Jour. Geol. Geophys･, vol. 12, no. 2-3, p. 551-523, 18 figs. , 1970-Zoophycos and similar fossils, in. Trace Fossils, Geol. Jour. Spec. Issue ｎ０. 3, p. 361-370, 4 ngS･， 2 pis. Rodrigue, J., and Ｒ. C. Gutschick, 1970-Late Devonian-early Mississippian ichnofossils from western Montana and Northern Utah, in. Trace Fossils, Geol. Jour. Special Issue, no. 3, p. 407-438, 10 pis. Tanaka, K., 1971-Trace Fossils from the Cretaceous of the Ikushumbetsu Area Hokkaido, Japan. Geol. Survey Japan Rep. Ｎ０. 242, p. 1-31, 11 pis., 1 table. Webby, B. D., 1969-Trace Fossils Zoophycos and Chondrites from the Tertiary of New Zealand. N. Z. Jour. Geol., Geophys., vol. 12, p. 208-214, e ngS･ Younge, C. M.. 1949-The Sea Shore, Collins St. Jame's Place London, p. 218, fig. 65.

(Manuscript received August 2，1976) (Published november 29, 1976) PLATE Ｉ Explanation of Plate 1

(ＡｌｍｏＳtin natural size)

Fig. 1 Ｐｅｃti？ａａｒia kiienｓiｓKatto, n. sp･ Sea coast of Nakahirami, Kushimoto-cho, Wakayama Prefecture. Tako Formation. Miocene.

Ｆ逗. 1. ＳａｌｍａｃｉｎｏｉｄｅａｋｕｓhimotｏｅｎｓiｓKatto,n. gen. ｎ. sp･ Sea coast of Eda, Kushimoto･cho, Wakayama Prefecture. Muro Group (e-bed). Oligocene. J. Katto : Additional Problemati･ca from Southwest Japan PI. 1

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PLATE 皿 Explanation of Plate 2

Figs. 1, 2.Ｎｅｒeitｅｓcf. ｍｕｒｏtｏｅｎｓiｓKatto. Fig. l isin about natural size. Fig. 2 is a distant view of the exposure. Seacoast of Nagasaki-hana, Kozukushi-cho, Sukumo City, Kochi Prefec- ture.Oligocene. J. Katto : Additional Problematica from Southwest Japan PI. 2

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ＰＬＡＴＥダⅢ Explanation of Plate 3 (Almost in natural size)

Figs. 1-3.Ｔｏｓａｌｏｒbtｓ feattｏtHatai and Kotaka. ＝ Sea coast of Nakahirami Kushimoto-cho, Wakayama Prefecture. Tako Formation. Miocene. 。。 J. Katto : Additional Problematica from Southwest Japan PI. 3

PLATE TV Explanation of Plate 4

Figs.卜４. ＴｏｓａｌｏｒbiｓfeattｏｉHatai and Kotaka.

Fig. 1 is in almost natural size. Fig. 4 is a distant view of the exposure･

Sea coast of Eda, Kushimoto-cho, Wakayama Prefecture. Muro Group

(ｅ･bed). Oligocene. .－

Figsヽ2, 3.ＴｏｓａｌｏｒbiｓfeattｏｉHatai and Kotaka.

Figs. 2, 3. are distant views of the exposure: Sea coast of Nakahirami Kushimoto･cho,χiVakayama Prefecture. Tako formation. Miocene. J. Katto : Additional Problematica from Sowthwest Japan PI. 4

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PLATE Ｖ Explanation of Plate 5

Figs. 1, 2. TosaloΓ&ij sp. '･ Fig.1 is in about natural size. Fig. 2 is a distantview of the exposure. Sea coastof Nakahirami Kushimoto-cho, Wakayama Prefecture. Tako Forma- tion.Miocene. ダ

Fig. ３．ＺｏｏｐｈｙｃｕｓSp･ Road-side cliff at Kunimi Nakamura City, Kochi Prefecture. Upper Cretaceous Arioka Formation. About natural size. J. Katto : Additional Problematica from Southwest Japan PI. 5

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ＰＬＡＴＥプVI Explanation of Plate 6

Fig. 1. IｓｃｈｎｏｃｈｉtｏｎtａｎｏｓａｋｉｅｎｓiｓKatto, n. sp･ Fig. 1 isin about ｘ0.８ natural size. Tanosaki nearKushimoto･cho, Wakayama Prefecture. Tanami Formation. Oligocene. J. Katto : Additional Problematica from Southwest Japan PI. 6