COI^CHIPEEA. 481 



Gasteana, Schumaclier, 



Synonyms^ Fragilia, Desh. Diodonta, F. and H., not Schu- 

 macher. 



Type, Tellina fragilis, L. ' PL XXI., Fig. 8. 



Shell, equivalve, convex, with, squamose lines of growth ; 

 cardinal teeth 2 in right valve, 1 bifid tooth in left ; pallial sinus 

 deep and rounded ; umbonal area punctate ; ligament external. 



Animal with the mantle open in front, its margins fringed; 

 siphons elongated, slender, separate, unequal, orifices with cirri ; 

 foot small, compressed, linguiform; palpi large, triangular; 

 gills unequal, soft, finely striated. 



Oastrana inhabits shallow water, boring in mud and clay, and 

 not travelling about like the Tellens. 



Distrihution, 3 species. Norway, Britain, Mediterranean, 

 Black Sea, Senegal, Cape. 



Fossil, Miocene — . Britain, France, Belgium. 



Capsula, Schumacher. 



Etymology, Dimin. of capsa, a box. 



Synonyms, Capsa (part), Brug. 1791. Sanguinolaria, Lamarck, 

 1818, not 1801. 



Type, 0. rugosa, PI. XX., Fig. 19. (= Yenus deflorata, 

 Gmel). 



Shell oblong, ventricose, slightly gaping at each end ; radiately 

 striated ; cardinal teeth 2 in each valve, one of them bifid ; liga- 

 ment external, large, prominent ; siphonal inflection short. 



Animal like Psammobia ; foot moderate ; gills deeply plaited, 

 attenuated in front, outer small, dorsal border wide, fixed ; 

 siphons moderate. 



Distribution, 4 species. "West Indies, Eed Sea, India, China, 

 Australia. 



Fossil, 20 species. Carb. — . United States, Europe. (D'Orb.) 



QuENSTEDTiA, Morris and Lycett. 



Hinge in left valve with obtuse, oblong, transverse teeth; 

 pallial sinus small ; ligament in a narrow groove ; cardinal 

 teeth 0.1. 



Psammobia, Lamarck. Sunset-shell. 



Etymology, psammos, sand, bio, to live. 



Y 



