CONCniiUA—niTHYRA. 11. 30 



Shell somewhat triangular, inequi valve, inequilateral, closed. 

 •Hinge with a single conic tooth and adjacent hollow in the left 

 valve, and a spoon-shaped tooth with a hollow in the right : 

 lateral teeth none. Ligament internal. 



Lamarck, in his character of this genus, affirms that there is a 

 conical tooth in each of the valves ; but in the smaller and flat 

 valve, there is evidently only an oval projecting hollow plate for 

 the reception of the ligament. 



CORBDLA. Nucleus, 



Tab. nost. 3, fig. 8 to 10. 

 Mya inajquivalvis. Montagu, Test. Brit. p. 38, tab. 2Q, fig. 7. 



Pennant, Brit. Zool. iv. p. 166. 



Linn. Trans, viii. p. 40, tab. 1, fig. 6. 



Turton, British Fauna, p. 147. 



Wood, Conch, p. 113. 



Dillwyn, Descript. Catal. p. 55. 



Turton, Conch. Diet. p. 107. 

 Cardium striatum. Walker, Test. Minut. p. 24, dg. 85. 

 3Ius. nost. Dredged in Torbaj', and other coasts. 



Shell about a quarter of an inch long, and nearly half an inch 

 broad, of a somewhat triangular figure, strong and opake, f^ene- 

 rally covered with a brown skin, under which it is whitish or 

 riesh-color: the larger or right hand valve convex, regularly 

 striate transversely, inclosing the lesser valve, over which the 

 beak projects and curves inwards; the lesser valve fiattish, with 

 a few longitudinal raised striae ; inside smooth, polished round the 

 margin. 



