CHAMA, CARDIUM AND VENUS 



83 



Fig. 57. X I 



is given in Figure 57, to which reference has already 

 been made on page 21. The outside of the shell is 

 marked with many low, concentric ridges, and innu- 

 merable, minute ribs. The valves are thin and the 

 color is brownish gray. 



Figure 58 represents Liocy??ia 

 scammoni^ Dall, Scammon's Lio- 

 cyma, which is found off the 

 coast of British Columbia. The 

 shell is dark, solid, with strong 

 hinge and 

 ligament. 

 The pallial sinus is small. 



hiocyma viridh^ Dall, the 

 Green Liocyma, is a far 

 northerner, being found in the 

 neighborhood of Bering Strait. 



Fig. 58. X I (*) 



Fig. 59 (*) 



