GO^GBYLIA—DITHYRA. 11. 39 



Shell somewhat triangular, equivalve, 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. 



GoBBULA. Nucleus. 



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



Mya inaequivalvis. Montagu, Test. Brit. p. 38, tab. 26, fig. 7. 



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



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



Turton, Brit. Fauna, p. 147. 



Wood, Conch, p. 113. 



Dillwyn, Descript. Catal. p. 55. 



Turton, Conch. Diet, p. 107. 

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

 Mus. nost. Dredged in Torbay, 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, gene- 

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

 flesh-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 flattish, with a few longitudinal 

 raised striae : inside smooth, polished round the margin. 



