CONTRIBUTIONS FROM THE CUSHMAN LABORATORY FOR FORAMINIFERAL RESEARCH VOLUME 22, PAR'f 2 June-, 1946 Contents P:AGE Ne, 216. The Genus Sigmoilin;a and [ts Species 29 No. 27'?. A Foraminif.eral fauna From the Paleocene of Arkansas 45 No. 278. Some New Species and Varieties of Fornminitera Irem ~ae 'Pliocene of Timms Point, Callforonia 65 Recent Literature en the For.aminifera 69 SHARON, MASSACHUSETI'S, U. S. A. 1946 CUSHMAN LABORATORY FOR FORAMINIFERAL RESEARCH 9G 'B.rnok Read, Sharon, Mass., U. S. A. JosEP!ll A. Cusli!MtAN, Sc.D., Direccor At.rca E, CUSHMAN, Secretwry, in char.ge of Publications Rt!ln1 Teen, M. S., Research Associate These Contributions wiH be issued quanedy. They will cenraia sh0M: papers with plates, describing new foums and other interesting notes on the general tesearcn work eFI the Ieraminifera being d0F1e 0F1 the group by the workers iH this laboratory. 'New Iitera• ture as it corrres to hand will be briefly reviewed. Subscription $2.$0 per year w0s.t Jilllrcil. 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L !F0ramiRlfera, l'heit Olassificatioi:i and Ec0n(i)mic Use. 1928 $5.00 No. 2. A Resume ef New Genera of the fl<otaiitlvnifer<1 Etected Since Early 1928. 1.930. .. .. .. ,.......... .50 N0. 3. A Bibliography (i)f Armenican F0raminifera. 1932. 1.10 (No. 4: Forarnimifera, Theit Classification ancl li:conomic Use, Editiot11. 2. 1933. Out of l'~int.) No. 5. An IHl!lstTated Key t(i) the GeHem 0f ~he !Feram•inifeua. l933 LOO Fereiga 1.50 No. 6. New Genera and S;pecies ef the Families VerneuiliFticil.a-e and Valvu- li11idae and of the Subfamily Virgulininae. 1936 UO iFor contlmtaliioH i!!f this series, see back cever page. Copies of ¥e'hwne 22, Part 2, were first ma~led June 1, 1946 DORR'S 'PRINT SHOP, BRIDG'.IllWATER, MASSACHUS'IDTTS, 'IJ, S. :A. 276. THE GENUS SIGMOILINA AND ITS SPECIES BY JOSEPH A. CUSHMAN In the following pages the results are given of a study of available ma• terial, Recent and fossil, that seems to belong to Sigmoilina. A study of actual specimens shows that more than one species have been included under some of the specific names, and these are separated and given new names. Original descriptions and type figures of most of the known species and varieties are reproduced. The range of the genus is throughout the Tertiary and in the present oceans. Unlike most of the Miliolidae, the species of Sigmoilina are mostly found in fairly deep water, although some occur in warm, tropical waters. The genus was developed from Quinqueloculina by the addition of planispiral chambers not in one plane but in a sigmoid manner. Genus SIGMOILINA Schlumberger, 1887 Genotype: Planis pirina sigmoidea H. B. Brady Sigmoiiina SCHLUMBERGER, Bull. Soc. Zoo!. France, vol. 12, 1887, p. 118.-CusHMAN, Bull. 71, U. S. Nat. Mus., pt. 6, 1917, p. 60; Smithsonian Misc. Coll., vol. 77, No. 4, 1925, p. 53.-GALLOWAY and WrssLER, Journ. Pal., vol. 1, 1927, p. 39.-CusHMAN, Special Publ. l, Cushman Lab. Forarn. Res., 1928, p.150; Bull. 10·1, U.S. Nat. Mus., pt. 6, 1929, p. 48; Bull. 161, pt. 1, 1932, p. 45; Special Pub!. 4, Cushman Lab. Foram. Res., 1933, p. 149; Forarninifera, 3rd Ed., 1940, p. 165. Spimloculina (part), Planis-pirina (part), Quinq·u.elocu.lina (part), and Miliolina. (part) of authors. Test with the early chambers quinqueloculine, later ones added in planes slightly more than 180° from one another, making a continuously revolving spiral, in transverse section giving a sigmoid appearance; wall often with an outer arenaceous layer; aperture rounded, with a simple tooth.-Tertiary, Recent. The known species are given, grouped in geologic sequence, and a few doubtful forms are listed at the end. CRETACEOUS SPECIES SIGl\lOJLINA'l PAI•YJtAC.EA (Burrows, Sherborn, and Bu ll ov) (Pl. 5, fig, l) Spiroloculina jJa.jJyracca. Bunuows, SHERBORN, and BAILEY, Journ. Roy. Mier. Soc., 1890, p. 551, pl. 8, fig. 1. Sig-moilina pa.pyracea CusHMAN and Toon, Special Publ. 11, Cushman Lab. Foram. Res., 1944, p. 76. This species was named from a single broken specimen of which less than half of the original was present. The only description consists of the --·- -···-·--~-·---· --------~] I LIBR/~RY I (~'P!'HfMIA.N L~•O!tli.TUP.T I I --···---·--- 30 CONTRIBUTIONS FROM THE CUSHMAN LABORATORY following: "The lower half of a thin and much compressed form from the red chalk of Fl.amborough Head." In some respects their figure, which is copied on our plate, suggests Sigmoilino. but without more evidence it must be left very doubtful. EOCENE SPECIES SIG1'10lLINA sn. Cushman n.nd Bm-ksda.Ie (Pl. 5, fig. 2) Sigmoili1la sp, CusHMAN and BARKSDALE, Contr. Dept. Geo!., Stanford Univ., vol. 1, No. 1, 1930, p. 62, pl. 11, fig. I. The figure shows a species of Sigmodina but the few available speci• mens did not give the complete characters and were not sufficiently well preserved to give the details necessary for a complete description. The species is from the Eocene, Martinez formation, west side of Martinez, Contra Costa Co., Calif. SIGl\lOILINA 81•. Cushman nnrl Siegt'us (Pl. 5, flg'. 3) Sigmoilvna sp, Cus1·IMAN and SIEGFUs, Trans. San Diego Soc. Nat. Hist., vol. 9, 1942, / p. 404, pl. 15, fig. 18. A reexamination of the specimens from the Eocene, Kreyenhagen shale, of California shows that it is very evidently a Sigmodina. It is an arenaceous form with a large proportion of cement and unlike any of the known species. However a full description cannot be given until better specimens are available. SIGMOILINA INCONSl'ICUA Howe (Pl. 5, ns. 4) Sig-mo•ilina nicons-picu.a Howe, Geo!. Bull. 14, Louisiana GeoL Survey, 1939, p. 36, pl. 2, figs. 16-18. "Test very small, fragile, elongate, compressed; chambers narrow, rounded in transverse section, arranged in a faintly sigmoid pattern; su• tures distinct, curved; wall smooth; aperture tiny, rounded, with a dis• tinct neck." Holotype, length 0.35 mm.; breadth 0.17 mm. The types of this species are from the Claiborne Eocene, Cook Moun• tain formation, Winn Parish, Louisiana. This seems to be the oldest species that can be fully described. OLIGOCENE SPECIES SIGMOJI,INA OltlNOCOJ';NSlS Hedberg (Pl. 5, flg'. 5) S·ig11wilina orinocoensis HEDBERG, Journ. Pal., vol. 11, 1937, p. 669, pl. 90, fig. 13.-FRANK• LIN, I. c., vol. 18, 1944, p. 308, pl. 45, fig. 't "Test small, stout, sigmoid in cross section. Chambers few; sides cov• ered with fine arenaceous matter so that only last two chambers are dis• tinct. Periphery broadly rounded to truncate. Last chamber projecting at apertural end. Aperture elliptical with a blunt tooth. Holotype, length, 0.52 mm.; width, 0.36 mrn.; thickness, 0.25 mm." FOR FORAMINIFERAL RESEARCH 31 The types are from the Oligocene, middle zone of the Carapita forma• tion, in Venezuela. SIGMOILINA OLIGOCBNICA Cushmun, u, SJ>. (Pl. r,, fig. G) Signwilina. t.enniis NurrALL (not CzJZEK), Journ. Pal., vol. 6, 1932, p. 9, pl. 1, fig. 4.• FRANKLIN, I. c., vol. 18, 1944, p. 308, pl. 45, fig. 5. Test strongly compressed, less than twice as long as broad, periphery rounded, earlier portion quinqueloculine, later nearly planispiral but somewhat sigmoid; chambers distinct, rounded in transverse section, pro• jecting slightly at the base; sutures fairly distinct, slightly depressed; v~all smooth, matte, very finely pitted; aperture in the adult terminal, with a very short neck. Length 0.50-0.70 mm.; breadth 0.30-0.38 mm.; thickness 0.08-0.10 mm. Holotype (Cushman Coll. No. 46244) from the lower Oligocene, Red Bluff clay, Red Bluff, on Chickasawhay River, Hiwannee, Miss. This species differs from S. tenuis ( Czjzek ) in the relatively broader test, shorter neck, and dull, matte surface. Specimens are common at the type locality and it also occurs in the Byram marl, at Pearl River, just above bridge at Byram, Miss. A series of specimens from the Oligocene, Alazan shale, of western Asuncion, Vera Cruz, Mexico, one of which was figured by Nuttall, comes within the measurements and ratios of this species.