40 



Family 6th. Heart shaped, umbones "prominent, and apices spirally recurved. 



Scientific name. Locality. Scientific name. Locality. 



Cor, Med., France, Bantry bay. Moltkiana, China. 



DIVISION II. Shell inequivalve. 



Lamellosa, 



Punctata, 



Sinistrorsa, 



Arcinella, 



Ponderosa, 



Guadaloupe. 



E. and W. Indies. 



do. Brazils. 

 South Seas. 



