CONCHXFEBA. 



243 



Philippi remarks that Mya pratenuis of Pennant and 

 Anatina Leana of Conrad belong to this genus. 



ExtodeS-MA. Philippi. — Shell somewhat inequivalve, 

 inequilateral, and slightly gaping, a strong epidermis : 

 hinge with no teeth, each valve having a half-moon shaped 

 projection, which supports the inner ligament : muscular, 

 and pallial impressions, from the iridescence and thinness 

 of the shell, not known. Animal unknown. — 1 species. 



The species is brought from the Island of Chiloe. 



Myochama. Stutchbury. — Shell inequivalve and 

 irregular, with two diverging car- 

 dinal teeth in each valve, in the 

 centre of which there is a trian- 

 gular cavity, having a small testa- 

 ceous appendage connected with 

 it by a horny cartilage ; one 

 valve is attached and flat; the 

 other is free and very convex, 

 covered with ribs, or interrupted 

 grooves, radiating from the im- 

 bones to the margin ; the ligament is thin, and external ; 

 the pallial impression exhibits a short broad sinus.* 

 Animal unknown. — 1 species. 



Myochama anomioides is the only species found at Port 

 Jackson, attached to other shells. 



Myocham a anom ioicles. 



Family 4. — C ORB ULA CJEA. 



The animals of this family are very little known. The 

 shells are generally small, inequivalve, closed, the ligament 

 internal. — Marine. 



* Reeve's Conch. Syst. 



R 2 



