702 PROCEEDINGS OP THE ACADEMY OF [NoV., 



each valve, the lateral edges of the chondrophore slightly raised, 

 so as to resemble ia some specimens two feeble cardinals ; feeble 

 elongate posterior right and anterior left laterals fit into grooves in 

 the opposite valve margins; the inner ventral margins crenulate. 



Subgenus CARDITELLA E. A. Smith, 1881. 



Type C. jmllida Smith, Magellan Straits. 



Valve trigonal, with strong radial sculpture with two cardinals in 

 each valve, of which the right posterior is ill defined, the resilium 

 sunken behind the two developed cardinals ; the ligament is feeble, 

 but there is a developed anterior and posterior lateral in each valve. 



Subgenus CARDITOPSIS E. A. Smith, 1881. 

 Type C. flahellmn Reeve. Chile. 



Like Carditella except that the ligament is obsolete and the re- 

 silium sunken between the beaks as in Erycinella. 



Genus CONDYLOCARDIA Bernard, 1897. 



Type C. pauliana Bernard. Atlantic Islands. 



Shell minute, with conspicuous prodissoconch, the hinge teeth 

 only partially developed out of the nepionic state, so that it is 

 difiicult to decide what portions of a continuous lamina should be 

 regarded as cardinal or lateral; subject to this caveat, the formula 

 of the hinge of the type species is \ p ^jp^i'" ; when compared 

 ^"^^^-^ RToiHbi)' ^^'^^ch is the formula of Erycinella, the relationship 

 is fairly evident ; the sculpture is variable in the different species, 

 but predominantly radial as a rule, the animal viviparous, another 

 link with the Carditidce. 



East American Species. 



Cardita (Carditamera) gracilis Shuttleworth, 1856. 



Blauquilla, Tortuga and Margarita Islands, Dautzenberg ; Porto 

 Rico, Blauner; Virgin Islands, St. Thomas, Swift; Tampa Bay, 

 Florida, Coll. U. S. N. Mus., 54,141. 



This is a small and delicate representative of C. arata of the 

 Florida Pliocene. 

 Cardita (Carditamera) fioridana Conrad, 1838. 



Cape Canaveral on the east coast of Florida, thence south and 

 west through the Gulf of Mexico to Yucatan, in shallow water. 



