34 



PRLECYPODA 



Class PELECYPODA. 



The mollusca of which the shells consist of two valves were called by Linnoeus 

 Bivalvia^ by Cuvier Acepliala (Headless), and by Blainville Lamellibranchiaia (with 

 lamellated branchiie or breathing gills), but the term proposed by Goldfuss, Pekcy- 

 poda (skin-footed), is now generally adopted as being more in conformity with the 

 designations applied to the other families. 



