CONCHYLIA— D/rHY22^. xxxlx. 



41. Cardium. 

 * costis spinosis vel tuberculatis . 



the ribs armed with spines or tubercles. 

 1. aculeatum, costis 21, anticis spinosis posticis tuberculatis. 



with 21 ribs, the anterior ones spinous and the 

 hinder ones tubercled. 



2. tuberculatum, costis 21, anticis tuberculatis posticis subsquamosis. 



with 21, ribs, the anterior ones tubercled and the 

 hinder ones somewhat scaly. 



3. echinatum, costis 18, spinis numerosis iiiflexis. 



with 18 ribs, armed with numerous inflected spines. 



4. elongatum, ovatum elongatum, costis 25 aculeatis. 



oval and elongated, with 25 jiricklj' ribs. 



5. nodosum, orbiculure, costis 26 crebro tuberculatis. 



orbicular, with 26 closely tubercled ribs. 



6. exiguum, subtrigonum, costis 20 tuberculatis. 



somewhat triangular, with 20 tubercled ribs. 

 ** costis transversim squamosis. 



the ribs armed with transverse scales. 



7. edule, subglobosum antiquatum opacum. 



somewhat globular antiquated and opake. 



8. fasciatum, orbiculare depressum subpellucidum. 



orbicular flat and semitransparent. 

 *** costis muticis. 

 the ribs unarmed. 



