376 



SHELLS AND SHELL-FISH. 



PART IF. 



Coralliophaga Blainv. Transversely cylindrical; the 

 bosses placed close to the anterior margin ; cardinal 

 teeth -f , one being bifid ; lateral teeth obsolete. A 

 doubtful type, but connected to Cardita. 

 C. carditoidea. Sow. Man. 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.^ Thin, oval, equilateral ; the ven- 

 tral margin considerably gaping ; cardinal teeth -1 ; 

 ligament internal and external. 

 G. Turtoni. Sow. Gen. f 1 3. Mauritiana. Ib. f. 4, 5. 



VENERUPES $ Lam. Animal perforating, analogous to 

 that of the Solens ; shell transverse ; the anterior side 



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

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

 Sa.Ttcava, with the thickened hinge margin of Thracia. 



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



J Judiciously contracted from Venerirupes. These perforating animals 

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



