VENERID^. 



63 



Artemis (Poli). Sliell round, compressed, marked 

 witli concentric lines ; ligament smik, margins 

 smooth ; hinge with three cardinal teeth, and one 

 front tooth beneath the lunule. Animal with a 

 large, hatchet-shaped foot; edges of the mantle 

 slightly plaited ; siphons entirely miited, plain. 



A, exoleta. Fig. 92 ; ^ n. s. 

 lincta. 



Cytherea (Lamk.). Shell thick, ovate or round; 

 margins single ; hinge as in AiHemis. Animal 

 with the mantle-edges plain; siphons united 

 half-way. 



C. Chione. Fig. 93 \ -J n. s. 



93 



Venus (Linn.) Shell thick, ovate or round, 

 often marked with crossed furrows ; margins 

 minutely notched ; hinge-teeth | ; ligament promi- 

 nent ; lunule distinct ; pallial sinus small, angular. 

 Animal with mantle-edges fringed ; siphons sepa- 

 rate. 



V. casina. 

 fasciata. 

 gallina. 



v. ovata. 

 striatula. 

 verrucosa. Fig. 94 ; n. s. 



