6( 



16 



SHELLS AND SHELL-FISH. 



Coralliophaga Blainv. Transversely cylindrical ; the 

 bosses placed close to the anterior margin ; cardinal 

 teeth ^, one being bifid ; lateral teeth obsolete. A 

 doubtful type^ but connected to Cardita. 

 C. carditoidea. Sow. Man. f. 92. 



Thracia Leach.* Shell transversely oval^ posterior side 

 truncate ; bosses central ; lateral hinge margin thick- 

 ened ; ligament external ; no teeth } ; affinities and 

 rank uncertain. 



T. corbuloidea. Sow. Man. f. 93. 



Galeomma Turton.f Thin, oval, equilateral ; the ven- 

 tral margin considerably gaping ; cardinal teeth ^ ; 

 ligament internal and external. 

 G. Turtoni. Sow. Gen. f 1 — 3. Maiiritiana. lb. f. 4, 5. 



Venerupes :|: Lam. Animal perforating, analogous to 

 that of the Salens ; shell transverse ; the anterior side 



* I have not seen this shell ; the figure, but not the definition, being in 

 Sowerby's Manual. Sphccnia, Turton, seems to be an aberrant species of 

 Saxicava, with the thickened hinge margin of Thracia. 



t Passes into Gnstrockcena, and thus completes the circle of this tribe. 



t Judiciously contracted from Venerinipes. These perforating animal* 

 have no connection whatever with Pullastra. See Poli, vol. ii. 



