OTHER BIVALVE MOLLUSKS 



% 



Fig. 74.x t (*) 



Macoma sitkana^ Dall, the Sitka Macoma, is 

 shown in Figure 74. The shell is thin and white, 

 while the other features are well brought out in the 

 engravings. As its name indicates, its home is in 

 Alaska, reaching northward from Sitka. 



Fig. 75 



Macoma secta^ Conrad, the Giant Macoma, is 

 shown in Figure 75. It is the largest and finest spe- 

 cies of the whole genus. The general form of the 

 shell is oval, but the posterior end is suddenly con- 

 tracted. Thin and glossy, with some epidermis 

 around the edges. Pallial sinus large, ligament 

 strong and broad, making a conspicuous external 



