. Bulletins of American paleontology. 164 Bulletin 277. Text-fig. 11. — Septal suture of Phylloceras ? sp. juv. indet., McM - J 1509/339, at H 1= 24 mm. Phylloceras ? sp. juv. indet. PL 25, figs. 34; Text-fig. 11 ?IS9S. Phylloceras cf. vellfdoe (Michelin), Aguilera in Castillo and Aguilera, Com. Geol. Mexico, Bol. 1, p. 13, pi. VI, fig. 9. Material. — Fourteen small internal molds of phragmocones with minor test remains in different modes of preservation: four from loc. 23A (McM - J 1505/186-188, 198); eight from loc. 23B (McM -J 1506/91, 211, 220, 391-394, 396); one from loc. 24 (McM -J 1509/
. Bulletins of American paleontology. 164 Bulletin 277. Text-fig. 11. — Septal suture of Phylloceras ? sp. juv. indet., McM - J 1509/339, at H 1= 24 mm. Phylloceras ? sp. juv. indet. PL 25, figs. 34; Text-fig. 11 ?IS9S. Phylloceras cf. vellfdoe (Michelin), Aguilera in Castillo and Aguilera, Com. Geol. Mexico, Bol. 1, p. 13, pi. VI, fig. 9. Material. — Fourteen small internal molds of phragmocones with minor test remains in different modes of preservation: four from loc. 23A (McM - J 1505/186-188, 198); eight from loc. 23B (McM -J 1506/91, 211, 220, 391-394, 396); one from loc. 24 (McM -J 1509/339); one from loc. 25 (McM - J 1517/88). Description. — The shell is obvolute and compressed with elliptical whorl section. The flanks are weakly convex and the venter is narrowly rounded. The surface ornament of the shell is generally unknown, except for the presence of dense weak riblets on the venter of some specimens. Constrictions or ventral flares appear to be absent. The septal suture (Text-fig. 11) of specimen J 1509/339 at 24 mm whorl height is almost ammonitic rather than phylloid. Some specimens have terminal approximated sutures indicating adulthood. Rema/rks. — The septal suture, at least of some specimens, is reminiscent of some CaUiphylloceras figured by Geczy (1967, pp. 22- 45, pis. V-XIII, LXIII, LXIV), of which a few also seem to miss constrictions or flares. A specimen described bv Aguilera (1895) as Phylloceras cf. velledoe is not available in Mexico; from its poor illustration, it appears to be similar to our specimens. Occurrence. — All specimens except j 1517/88 come from Virgatosphinctinae beds, upper part of El Pastor Member, La Caja. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Paleontological Research Institution (Ithaca, N. Y. ); Columbia University. Ithaca, N. Y. ,
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