74 WEST AMERICAN SHELLS 
Figure 60 represents Lio- 
cyma scammont, Dall, Seam- 
mon’s Liocyma, which is 
found in British Columbia. 
The shell is dark, solid, with 
strong hinge and ligament. 
Fig. 60, x & (*) The pallial sinus is small. 
Liocyma viridis, Dall, 
the Green Liocyma, is a 
far northerner, being found 
in both directions from 
Bering Strait. The shell 
is oval, and when fresh it 
is of a fine olive-green 
color, which bleaches to 
cream. In each valve are three cardinal hinge-teeth, 
the middle one being cleft. 
Venerupis lamellifera, Conr., 
the Rock-Venus, (Rupellaria 1.) 
is Shown in Figure 62. The shell 
is white, very irregular, and is 
marked with many thin, concen- 
tric lamine, which sometimes are 
very prominent. There may also be a trace of 
obsolete ribs. In habit it is a nestler among rocks. 
Some specimens are considerably larger than the 
figure. 
Figure 63 gives two 
good views of Psephidia 
lordi, Baird, Lord’s Peb- 
ble-shell, a plump little 
species which lives off the 
shore, below tide line,from 
