ANOMALOCARDIA. 



535 



Gambiensis, Reeve. 

 glacialis, Gray. 

 Helblingii, Chem. 

 illota, Soiv. 

 lacerata, Linn. 

 lactea, Linn. 

 lima, Reeve. 

 lurida, Sow. 

 rainuta, Reeve. 

 nivea, Gmel. 

 nodulosa, Miiller. 

 obliquata, Gray. 

 obtusa, Reeve. 

 olivacea, Reeve. 



parva, Soiv. 

 raridentata, Wood. 

 Reeveana, D'Orb. 

 setigera, Reeve. 

 striata, Reeve. 

 symmetrica, Reeve. 

 tenebrica, Reeve. 

 tenella, Reeve. 

 trapeziua, Lam. 

 velata, Soiv. 

 vespertilis, Cpr. 

 virescens, Reeve. 

 Zebuensis, Reeve. 



Sub-gen. acar, Gray. 



Sbell with the valves cancellately ribbed or costated ; hinder 

 slope sub-carinate. 



Adamsii, Shuttl. 

 bullata, Reeve. 

 divaricata, Sow. 

 Domingensis, Lam. 

 donaciformis, Reeve. 



gradata, Brod. and Sow. 

 pulchella, Reeve. 

 pusilla, Soiv. 

 sculptilis, Reeve. 

 solida, Sow. 



Sub-gen. calloarca, Gray. 



Shell with the hiuder slope strongly keeled ; front and hinder 

 margins dentated. 



alternata, Reeve. 



Genus ANOMALOCARDIA, Klein. 



Shell thick, sub-cordate or sub-quadrate, sub-equila- 

 teral, equivalve, closed in front ; surface of valves strongly 

 radiately ribbed, and covered with an olive, smooth 



