188 WEST AMERICAN SHELLS 
Columbélla permodeésta, Dall, 
the Modest Dove-shell, Figure 
190, has a thin, polished shell of 
bluish white color, covered with 
a pale, yellowish epidermis. Its 
real length is 14mm. It was 
dredged from deep water off the 
Santa Barbara Islands. 
Amphissa versicolor, Dall, the 
Joseph-coat Amphissa, Figure 
191, is a very common shell along Fig. 190, x 1(@) 
the coast of California. The drawing 
gives a very correct idea of the appear- 
ance of the shell, though it is consider- 
ably enlarged, the common length being 
Fig-191,x78 or 10mm. The color varies exceed- 
ingly, as the name indicates. Some shells are red- 
dish, others yellow, while still others are various 
shades of gray, and even almost black. <A collee- 
tion of these shells furnishes a very pretty assort- 
ment of tints. Living specimens are not so often 
found as dead shells, but at low water they may be 
discovered, clinging to the rocks. 
Amphissa corrugata, Rve., the Wrinkled Am- 
phissa. The species lives chiefly in northern 
waters, and was formerly supposed to include the 
last species. Its shell is much larger, however, the 
average length being 84 of an inch. It has a less 
ventricose body-whorl, and relatively finer seulp- 
turing. It is usually of a light yellowish brown 
color. 
