Plate 2 



Fig. 1. Hinnites giganteus Gray ; Rock scallop. Monterey Bay. Nearly natural 

 size (9/10). Exterior of upper (left) valve. 



Fig. 2. Hinnites gigavteus, same specimen as Fig. 1. Exterior of lower (right) 

 or attached valve. The symmetrical outline of the shell at the time of attach- 

 ment is clearly shown. 



