62 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
Cryptoconus tremperianus Dali, 1911 
Plate 11, fig. 12 
Nautilus, 24:109. Bulletin 112, United States National Museum; PI. 12, fig. 5. 
Shell small, in the adult stage averaging about 62 mm. in length. It is 
much heavier, the anal fasciole is more strongly constricted, and the 
appressed margin of the whorl does not approach as closely to the 
periphery of the preceding whorl as in carpenteriana. The periphery is 
often marked by a minutely beaded or undulate thread, and is more nearly 
midway between the sutures on the spire than in car pent eriana. Aperture, 
32.1; spire, 32.2; diameter, 20.7 mm. (Dali.) 
Type in United States National Museum. Type locality, off San Pedro, 
California. 
Range. Point Ano Nuevo, California, to Cerros Island, Lower Cali¬ 
fornia. 
Cryptoconus stearnsianus Raymond, 1904 
Nautilus, 18:1. 
Shell broadly fusiform, spire acute, outline of spire moderately 
convex; whorls eight and one-half, convex anteriorly, slightly concave 
near the suture, the margin at the suture strongly appressed; suture 
distinct; aperture longer than the spire; color orange to cream, a broad, 
spiral, brown band below the suture and nine or ten, narrow, clearly- 
defined bands on the last whorl, one or two of these also visible on the 
spire, bands nearly as wide as the lighter interspaces; interior of the 
aperture yellowish, lighter within and spotted with brown on the outer 
lip by external bands; first two whorls smooth, later whorls with numerous 
revolving threads, closely beaded at the spire by incremental lines which 
follow the outline of the lip, threads not beaded below the periphery of 
the last whorl, but roughened by the growth-lines and somewhat coarser 
anteriorly; aperture rather narrow; posterior sinus shallow, rounded; lip 
acute, produced below the sinus, canal wide; pillar solid, somewhat 
curved, obliquely truncated below. Long, of shell, 30; of aperture and 
canal, 17; of body-whorl, 33; maximum diameter, 13 mm. (Raymond.) 
Type in University of California Collection. Type locality, off San 
Diego, California. 
Range. Monterey to San Diego, California. 
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