CONCHIFERA. 



241 



Myodora striata. 



jecting forward ; they have fringed edges ; foot narrow, 

 long and compressed. — Few species ; also fossil. 



Mya Norwegica of Chemnitz is the type of this genus. 



Myodora. Gray. — Shell triangularly ovate, inequi- 

 valve ; left valve concave, right 

 flat ; inequilateral, with a flat 

 depression under the bosses ; 

 hinge formed of two wide la- 

 teral teeth in the right valve ; 

 in the left two grooves to re- 

 ceive them ; ligament internal, 

 inserted into a triangular pit 

 between the teeth, often pro- 

 tected internally by a testace- 

 ous appendage ; valves pearly 

 within. Animal unknown. — 10 species.* 



Myodora striata is the most striking species of this genus ; 

 the author received several specimens from Port Nicholson 

 in New Zealand, in a very perfect state, with the shelly 

 testaceous appendage, or hinge piece still attached. 



Pandora. Brug. — Shell regular, oblong, valves un- 

 , equal and inequilateral, the upper 

 i one flat, the lower convex ; an ^ 



obtuse oblong tooth in one valve, V> 

 I and a cavity to receive it in the 



other : interior somewhat pearly ; 



ligament internal ; muscular impressions weak, rounded ; 



pallial with a very slight sinus. Animal, oval, compressed ; 



the mantle closed, except for the passage of a narrow 



tongue-shaped foot ; siphons very short, united nearly to 



their orifices, which are divergent and fringed ; the 



Pandora rostrata. 



* Reeve's Iconica. 

 R 



