18 MICHAEL A. MURPHY AND PETER U. ROD DA of the flank, but the first lateral lobe is whorl 32 mm., width of whorl 30 mm., um- trifid, complexly frilled, and about twice as bilicus diameter 23 mm. deep as the external lobe and very similar Remarks.—Puzosia sullivanae n. sp. re- to the corresponding elements in the geno- sembles P. dilleri (Anderson) (Anderson, type as figured by Wright (1957, p. L364, 1938, pi. 42, fig. 1, not pi. 42, figs. 2,3) more fig. 476-5c). The maximum size was prob- closely than any of the other California spe- ably over 8 inches in diameter as the holo- cies but has a much smaller umbilicus than type measures more than 6 inches in diam- the latter. eter (reconstructed) and is septate through- The species is named for Mrs. Catherine out. Sullivan near whose ranch the holotype was Holotype.—The holotype is specimen found. number 28656 U.C.L.A. Invert. Paleo. Cat. Genus MESOPUZOSIA Matsumoto, 1954 It was collected at locality 3477 on Coyote MESOPUZOSIA COLUSAENSE (Anderson) Creek. Dimensions: height of whorl 27 PI. 102, fig. 10 mm., width of whorl 16 mm. (approximate), width of umbilicus 25 mm. All measure- Desmoceras colusaense Anderson, 1902, p. 96,97. pi. v, figs. 128,129, pi. x, fig. 200. ments at 73 mm. diameter. Puzosia (Parapuzosia) colusaense (Anderson), Remarks.—P. puma n; sp. can be differ- Anderson, 1958, p. 236, pi. 10, fig. 1. entiated from other puzosids described from Pachydesmoceras colusaense (Anderson), Matsu- California by its high flat-sided whorl, wide moto, 1958, p. 652. shallow umbilicus and low, acutely rounded Shell large with ovate whorl section; um- umbilical wall. bilicus a little less than J diameter of the In addition to the locality of the holotype, shell; umbilical edge smooth, rounded; um- the species has been found in the mudstones bilical wall steep, rounded (convex), turned overlying the Bald Hills formation in the under at the umbilical seam; ornamentation North Fork of Cottonwood Creek area. of sigmoidal constrictions and ribs; the con- The trivial name is a synthetic word. strictions number 6 or 7 on specimens about 150 mm. in diameter, more constrictions per PUZOSIA SULLIVANAE n. sp. whorl (about 10) are apparently present on PI. 105, figs. 4,5 the younger shell judging from a partially Shell medium size with an ovate almost preserved specimen of about 50 mm. diam- equant adult whorl section; umbilicus a eter; Anderson (1902, p. 97) reported 10-11 little less than one third diameter of shell; constrictions on the young whorls of his umbilical edge rounded; umbilical wall specimen; number of ribs between each con- steep, convex, turned under at the umbil- striction varies greatly with growth, on ical seam; ornamentation consists of sig- specimens of about 150 mm. diameter, 17- moidal constrictions and ribs; constrictions 19 ribs are on the periphery, 10-13 on the 5 per whorl, moderately deep grooves on the flanks; ribs reach almost to the umbilical internal mold, cross the venter with a slight edge; suture puzosid, Anderson's figure anterior inflection, reflected on the external (1902, pi. 10, fig. 200) is good for the ex- shell; ribs between each constriction vari- ternal lobe, 1L and the outer part of the sus- able in number (19-27), very low and indis- pensive lobe. tinct on the periphery and absent on the in- Holotype.—The holotype is type speci- ner half of the flank to about 50 mm. diam- men number 4283 in the collections of the eter; ribs on the early part of the body California Academy of Sciences in San whorl reach the umbilical edge, may bifur- Francisco. It was found on the Petersen cate on the shoulder or arise by intercala- Ranch 4 miles north of Sites, Colusa tion on the shoulder; suture puzosid, com- County, California. plexly frilled. Remarks.—If the position of the ribs on Holotype.—The holotype, specimen num- the flank and the flatness of the flank be ber 28657 U.C.L.A. Invert. Paleo. Cat., was treated as definitive characters, this species collected at U.C.L.A. locality 3764 by W. P. cannot be placed in the genus Puzosia. It Popenoe. It is the only known specimen. Di- does not have the features of ornamentation mensions: at 77 mm. diameter, height of cited by Wright (1957, p. L365) for Pachy- MOLLUSC A OF CRETACEOUS ROCK, CALIFORNIA 849

Genus TURRILITES Lamarck, 1801 Lamarck (Sharpe, 1856, pi. 27, fig. 1), and TURRILITES (TURRILITES) DILLERI n. sp. T. wiestii Sharpe (pi. 27, fig. 8). Both of PI. 103, fig. 6 these specimens have been referred to T. Apical angle about 21°; the whorl is orna- acutus Passy by Wright and Wright (1951, mented by three rows of bullate or tubercu- p. 40). T. dilleri appears to be more loosely late prominences which are connected by coiled than these specimens. In Sharpe's faintly developed transverse ribs that ex- figures the lower bulla is not visible when tend from slightly below the lower row of the succeeding coil is present, but it is vis- prominences to the upper whorl suture; the ible on T. dilleri. lower prominence is elongate slightly in a The species is named for J. S. Diller direction about 60° from the direction of the pioneer worker in northern California ge- axis of coiling; the middle prominence is ology. more or less equidimensional; the upper prominence is elongate in a direction at a Family DESMOCERATIDAE Zittel, 1895 slight angle to the axis of coiling; maximum Genus PUZOSIA Bayle, 1878 length of shell probably exceeded 3 inches. PUZOSIA PUMA n. sp. Holotype.—The holotype, specimen num- PI. 104, figs. 5,6 ber 28655 in the U.C.L.A. Invert. Paleo. Shell compressed with a high, flat-sided Cat., consists of two complete whorls of a whorl cross section; umbilicus wide and completely septate shell with a maximum shallow in comparison to most members of diameter of 18 mm. The holotype and the genus (25 mm. at a diameter of 73 mm.); three other specimens were collected from umbilical edge sharply rounded; umbilical U.C.L.A. locality 3464. All four have vir- wall low, steep, abutting previous whorl at tually the same characteristics of ornamen- umbilical seam; ornamentation consists of tation even though each specimen represents sigmoidal constrictions and ribs; the con- a different growth stage. strictions number about 5 per whorl, are Remarks.—Turrilites (Turrilites) dilleri n. deep and prominent from umbilical seam to sp. differs from T. oregonensis Gabb (1864, umbilical seam, cross the venter with a pi. 28, fig. 201) in having only 3 rows of pointed anterior inflection, show on the ex- prominences rather than 4. uTurrilitesu ternal shell as shallow groves preceded by a Carlottensis Whiteaves (1900, pi. 34) prob- low labial ridge; constrictions are inflected ably belongs to Emperoceras or some closely forward at a greater angle than the inter- related genus. T. dilleri n. sp. differs from vening ribs, and, therefore, intersect several the genotype, T. costatus Lamarck, in the of the anteriormost ribs of each intra-con- proportions of the bullae and a much less striction space; between each constriction prominent spiral trough separating the pos- are about 13 subdued sigmoidal ribs that terior bulla from the anterior ones. arise near the lower quarter of the flank and T. (T.) dilleri closely resembles two of cross the venter without interruption. The Sharpe's figures of Turrilites, T. costatus suture line is not exposed on the inner half

EXPLANATION OF PLATE 104 All figures XI FIGS. 1-3—Eogunnarites matsumotoi n. sp. 1, cross-section view of holotype, 28664 U.C.L.A. Invert. Paleo. Cat.; 2, lateral view of holotype; 3, fragment of body whorl of the holotype. 4—Beudanticeras haydeni (Gabb). View of specimen 28660 U.C.L.A. Invert. Paleo. Cat. show- ing first lateral lobe of suture. 5,6—Puzosia puma n. sp. Ventral and lateral views of the holotype, 28656 U.C.L.A. Invert. Paleo. Cat. JOURNAL OF PALEONTOLOGY, VOL. 34 PLATE 104 Murphy & Rodda