CLASS GASTROPODA 
281 
coast of British Columbia and in Puget Sound, it may take the name 
Columbiana. (Dali.) 
Type in Museum Cuming. Type locality, Puget Sound. 
Range. Chiachi Islands, Alaska, to San Pedro, California. 
Amphissa versicolor Dali, 1871 
American Journal of Conchology, 7:113; PI. 16, figs. 10, 11. 
Shell of about five whorls, last whorl two-thirds the length of the 
shell. Epidermis imperceptible; shell ornamented with rather strong sinu¬ 
ous ribs, which often invade the lower third of the whorl; there are four¬ 
teen to sixteen of these on the last whorl in well-grown individuals, and 
they are crossed by rather strong, thread-like lines, between broad channels 
on the convexity of the whorls, which become narrower and groove-like on 
the anterior part of the last whorl. They are about seventeen in number, 
in average adult specimens, on the last whorl. Post-labial pinch almost 
obsolete, quite so in some specimens. Colors very variable, pink-salmon 
color, livid bluish-purple, brown and pure white, all plain, or variously 
marked with a network of white and brown lines, patches, dots, etc., etc. 
Long., .48; lat., .26 in. (Dali.) 
Type in United States National Museum. Type locality, Monterey, 
California. 
Range. Oregon coast to Cerros Island, Lower California. 
Amphissa versicolor incisa Dali, 1919 
Plate 16, fig. 3 
Proceedings of the United States National Museum, 56:331. Bulletin 112, United 
States National Museum; PI. 11, fig. 10. 
Shell varicolored, acute, solid, with a thin brownish fibrous periostra- 
cum, with about eight whorls, including the smooth nucleus of about one 
whorl, the rest of the shell strongly sculptured; spiral sculpture of (on the 
spire about 6, on the last whorl about 16) strong, low, rounded, equal and 
equally spaced cords, except one in front of the almost channeled suture, 
which is slightly more prominent than the others, separated by much nar¬ 
rower deep grooves; the spirals not nodulous when they cross the ribs; 
axial sculpture of (on the penultimate whorl, about 14) obliquely pro- 
tractive rounded ribs with subequal interspaces, somewhat obsolete near 
the aperture, which is semilunate; outer lip hardly thickened, whitish, 
lirate within; body and pillar with a layer of whitish enamel; canal short, 
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