256 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
inclosed between the spiral cords and the axial ribs are feebly impressed, 
squarish pits. In addition to the above sculpture, the entire surface of the 
shell is crossed by fine incremental lines and very fine spiral striations. 
Sutures strongly impressed, with the peripheral cord showing as a slender, 
smooth band in all but the first two whorls. Periphery of the last whorl 
marked by a broad, depressed spiral cord which is separated from the 
first suprasutural cord of the spire by a sulcus as wide as that separating 
this cord from its posterior neighbor. This groove is crossed by the 
continuations of the axial ribs. Base large, moderately rounded, marked 
with a slender spiral cord which is a little nearer the peripheral cord than 
the slender fasciole at the insertion of the columella. Aperture irregularly 
ovate; outer lip thin, rendered sinuous at the edge by the external sculp¬ 
ture showing the internal sculpture within; columella stout, rather long, 
twisted and curved; parietal wall glazed with a thin callus. Type has lost 
all but the post-nuclear whorl. Length, 5.8; diameter, 2.1 mm. (Bartsch.) 
Type in United States National Museum, No. 153057. Type locality, 
Government Jetty, San Diego. 
Range. Known only from type locality. 
Cerithiopsis stejnegeri Dali, 1884 
Plate 70, fig. 3 
Proceedings of the United States National Museum, 7:345; PI. 2, fig. 4. 
Shell broadly conic, light chestnut brown, excepting the nucleus and 
the columella. Nuclear whorls two, strongly rounded, smooth. Post- 
nuclear whorls well-rounded, marked with three nodulose spiral keels, of 
which one is at the shouldered summit, another somewhat posterior to the 
suture, while the third is median between the two. The anterior of the 
three is the strongest and the one at the summit is the weakest. These 
cords are about as wide as the spaces that separate them. In addition to 
the spiral cords the whorls are marked by very poorly developed, almost 
vertical, axial riblets, the junctions of which with the .spiral cords form 
the nodules. Of these ribs 16 occur upon the second, 18 upon the third, 
22 upon the fourth, 24 upon the fifth, and 26 upon the penultimate whorl. 
The spaces inclosed between the spiral cords and axial ribs are irregular,. 
shallow impressed, rounded pits. Sutures strongly constricted, showing 
the posterior edge of the base. Periphery of the last whorl marked by a 
sulcus which is crossed by the feeble axial riblets; base well-rounded, 
smooth, excepting incremental lines. Aperture broadly ovate; decidedly 
channeled anteriorly; posterior angle obtuse; outer lip thin, rendered wavy 
by the external sculpture showing the external sculpture within; columella 
short, stout, twisted, and curved; parietal wall glazed with a thin callus 
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