488 ASTARTIDiE. 



Genus MYTILICARDIA, Blainville. 



Foot rounded, grooved, byssiferous. 



Shell elongate, oblong, very inequilateral, strongly cos- 

 tate, ribs scaly. Hinge with the front cardinal tooth 

 triangular, diverging; hinder cardinal tooth in the left 

 valve double, both laminre being equally developed, and 

 elongate; anterior lateral tooth wanting. 



Syn. Mytilocardita, Anton. Jesonia, Gray. 



Ex. M. calyculata, Bruguiere, pi. 116, fig. 3, 3, a. 



The species of Mytilicardia are widely distributed, being 

 met with in the Mediterranean and Red Seas, the Philip- 

 pines, the islands of the Pacific, and on the coasts of Africa 

 and South America. 



Species of Mytilicardia. 



calyculata, Brug. muricata, Sow. 



crassicostata, Lam. pica, Reeve. 



distorta, Reeve. radula, Reeve. 



Essingtonensis, Desk. rufescens, Reeve. 



excavata, Desk. teretiuscula, Phil. 



excisa, Phil. umbilicata, Desh. 



fabula, Reeve. variegata, Brug. 

 Jeson, Adans. 



Sub-gen. beguina, Bolten (Azarella, Gray). 



Shell roundish, compressed, striated, dilated behind. Front 

 binge-tooth elongate, compressed, similar and parallel to the 

 hinder ; lateral teeth none. 



gubernaculum, Reeve. volucris, Reeve. 



semiorbiculata, Linn. 



