176 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
rounded; axial sculpture of (on the last whorl, about 15) low, rounded, 
nearly vertical ribs, with about equal interspaces, which are strongest at 
the periphery and gradually become weaker in each direction, and obso¬ 
lete on the base; the periostracum is vertically wrinkled, but the incremen¬ 
tal lines are not conspicuous; spiral sculpture of (on the penultimate 
whorl, six or seven; on the last whorl, about twenty) flattish spiral threads 
with subequal or slightly narrower channeled interspaces, this sculpture 
extending to the tip of the canal ; these threads override the ribs but with¬ 
out turgidity at the intersections; aperture elongate, ovate; outer lip 
simple, sharp, not reflected; inner lip not callous, pillar short, obliquely 
attenuated; canal short, recurved, narrow; on the pillar one feeble plait is 
visible at the aperture, farther back there are two, and in the spire three 
with faint indications of a possible fourth plait, oblique and rather close 
together near the anterior edge of the pillar. Length of shell, 11; of last 
whorl, 8.5; of aperture, 5.5; max. diam., 5.5 mm. (Dali.) 
Type in United States National Museum, No. 193650. Type locality, 
off San Diego, California, in 822 fathoms. 
Range. Monterey Bay to San Diego, California. 
Genus FUSINUS Rafinesque, 1815 
Shell fusiform; spire long, acuminate, many-whorled; aperture oval, 
usually striate within; outer lip simple; columella smooth; no umbilicus; 
canal long and straight. Yellowish-brown or light horn-color, sometimes 
with red-brown strigae or spots; never banded. Operculum ovate, acute, 
with apical nucleus. (Tryon, Structural and Systematic Conchology .) 
This is Lamarck’s description of Genus Fusiis. 
Type. Fusus coins Linneaus. 
Distribution. Tropical and subtropical, world-wide. Cretaceous- 
Pleistocene. 
Fusinus traski Dali, 1915 
Plate 9, fig. 4 
Proceedings of the California Academy of Sciences, 1:43. Arnold, Paleontology of 
San Pedro, California; PI. 4, fig. 7. 
New name for F. rugosus Trask, 1855. 
Shell fusiform, somewhat thin, turreted; spire acute; eight convex 
whorls; two first without folds; nine distant folds on the last whorl be¬ 
coming obsolete on a line parallel with the posterior edge of the aperture; 
two last whorls traversed by small longitudinal wrinkles; about fourteen 
elevated, somewhat squared, lines on the last whorl, with intermediate 
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