60 



LUCINA. 



VENUS JAMAICENSIS. 



Chem. 7, p. 24, t. 39, fig. 408, 409- 

 The hinge of the shells of this genus seems to ally 

 them to the Tellens, particularly on account of the la 

 teral teeth; and though they also in many species pos- 

 sess a distinctly marked angular depression on the 

 shell, it is never flexuous, which circumstance proba- 

 bly induced Linnaeus to class them with the Veneres. 

 Shell suborbicular, inequilateral; small pointed apices. 

 The hinge very variable, but usually with two diverg- 

 ent primary teeth, one bifid, which change or become 

 obsolete with age ; two lateral teeth, the posterior one 

 nearest the hinge; two muscular impressions very 

 widely separated, the posterior one prolonged in a 

 small band sometimes extending to the centre of the 

 valve. 



Lucina Jamaicensis 



Pensylvanica 



edentula 



mutabilis 



radula 



Lucina concentrica 



divaricata 



carnaria 



scabra 



reticulata 



