. Bulletin. Science; Natural history; Natural history. Santa Ana 2415 Carlsbad-LACMIP 5328. "Pt. San Jose-LACMIP 5202, UCMP A-8580 Cabra-UCMP A-9122, A-9545 ^^-V~~~~\^ Rio del Rosario-UCMP D-8027 \Santa Catarina Landing-CAS 1431, UCLA 3268 LACMIP 1458 Fig. 1. Cretaceous localities in Baja California and California yielding the nautiloid samples dis- cussed in text. Eucymatoceras sp. Text-figure 2 Discussion.—Tv/o poorly preserved fragmental specimens of Eucymatoceras sp. show the characteristic conch shape and the ventral V-shaped ribs of the genus, but the V-shaped ribs are not
. Bulletin. Science; Natural history; Natural history. Santa Ana 2415 Carlsbad-LACMIP 5328. "Pt. San Jose-LACMIP 5202, UCMP A-8580 Cabra-UCMP A-9122, A-9545 ^^-V~~~~\^ Rio del Rosario-UCMP D-8027 \Santa Catarina Landing-CAS 1431, UCLA 3268 LACMIP 1458 Fig. 1. Cretaceous localities in Baja California and California yielding the nautiloid samples dis- cussed in text. Eucymatoceras sp. Text-figure 2 Discussion.—Tv/o poorly preserved fragmental specimens of Eucymatoceras sp. show the characteristic conch shape and the ventral V-shaped ribs of the genus, but the V-shaped ribs are not apparent on the whorl sides. The suture appears to be slightly sinuous; the conch is large, involute, and rapidly expanding; and the siphuncle is subcentral. Occurrence.—Eucymatoceras sp. occurs in the Alisitos Formation near Arroyo El Rosario, Baja California, Mexico (UCMP loc. D-8027). Range.—T\\Q Alisitos Formation ranges in age from Aptian to Albian (Allison 1955). ^oiy^es UCMP 14687-14688 from UCMP loc. D-8027. Gtrwxs Anglonautilus Sp^ 1927 Type Species: Nautilus undulatus Sowerby (1813) The genus Anglonautilus is a cymatocerid typified by large fold-like undulations on the venter that decrease rapidly on the flanks, sutures with shallow ventral and lateral lobes, and a subcentral siphuncle (Kummel 1964:K453). Anglonautilus has been previously reported only from beds of Hauterivian to Cenomanian age. 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 Southern California Academy of Sciences. Los Angeles, Calif. : The Academy
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