382 



LUTRARIINjE. 



Genus STANDELLA, Gray. 



Shell ovate, hinder slope more or less keeled. Hinge 

 with the lateral teeth short, smooth, the anterior oblique ; 

 ligament sub-external, marginal, not separated from the 

 cartilage. 



Ex. S. striatella, Lamarck, pi. 99, fig. 3, 3, a. 



The species of Standella are pretty numerous, and have 

 a wide geographical distribution ; they are found in China, 

 Ceylon, Australia, the Philippines, and on the coasts of 

 Africa and Western America. 



Species of Standella. 



bilineata, C. B. Adams. ovalis, Say. 



depressa, Spengl. ovata, Gray. 



elongata, Quoy. silicula, Desk. 



fragilis, Chem. striatella, Lam. 



lateralis, Say. velata, Phil. 



Sub-genus merope, H. and A. Adams. 

 Shell thin, surface of valves plicate, or radiately ribbed. 



iEgyptiaca, Chem. pellucida, Chem. 



anatinoides, Reeve. plicatilis, Desh. 



Californica, Desh. Senegaleusis, Phil. 



capillacea, Desh. Solanderi, Gray. 



Nicobarica, Gmel. tbracioides, Adams and Peeve. 



