14 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
This was Nuttall’s MS name. 
Shell white, solid, smooth, slightly arched, gradually increased, red 
near the apex, rather narrow, apical fissure small. (Conchologia Iconica.) 
Type in British Museum. Type locality, California. 
Range. Forrester Island, Alaska, to San Diego, California. 
Genus SIPHODENTALIUM M. Sars, 1859 
Shell an arcuate, slightly tapering tube, largest at the aperture, circular 
or nearly so in section, and smooth externally. Apex rather large, typically 
slit into lobes, but sometimes simple. Foot capable of expanding into a 
terminal disk. (Tryon and Pilsbry, Manual of Conchology .) 
Type. Siphodentalium lobatum Sowerby. 
Distribution. Arctic Ocean, Portugal, Gulf of St. Lawrence, Maine, 
West Indies, Finmark, Torres Strait, N.E. Australia, Korea, Canaries. 
Siphodentalium quadrifissatum Pilsbry, 1898 
Plate 1, fig. 7 
Tryon and Pilsbry, Manual of Conchology , 17:150; PI. 29, figs. 10-13. 
Shell arcuate, the bend greater posteriorly, slender, but slightly taper¬ 
ing, not swollen, subtransparent bluish, with a milky band near the larger 
end; smooth and rather glossy, the growth lines hardly visible; posterior 
third slowly tapering, the tube then nearly cylindrical almost to the aper¬ 
ture; quite near the latter it is contracted, the contraction greatest on the 
convex side. Greatest diameter contained about 7 times in the length of 
the shell. Aperture oblique, transversely oval; apex cut into four conic 
teeth by the same number of slits; the tooth on convex side slightly longest, 
the other three subequal in length, that on concave side wider and obtuse; 
edges of the teeth somewhat bevelled distally. Length, 8.6; diameter at 
aperture, 0.85x1.0; at largest, 1.12x1.22; at apex, 0.65x0.7 mm. 
(Pilsbry.) 
Type in Philadelphia Academy of Sciences. Type locality, San Diego, 
California. 
Range. San Pedro to San Diego, California. 
Siphodentalium 4-fissatum Carpenter, MSS label in Smithsonian Insti¬ 
tution, from San Pedro. 
Genus CADULUS Philippi, 1844 
Shell somewhat cask-shaped, short and obese, conspicuously swollen in 
the middle, tapering rapidly toward both ends: convex on all sides, though 
