DESCRIPTION. 133 



upper ones nearly triangular 5 connecting one cur- 

 ved, narrow, rounded on the back. 



Inhabits nearly all seas. 



The specimen from which the annexed drawing 

 was made, being a dried one, the peduncle is not 

 inflated, nor does it preserve its original colour, but 

 the skin which adheres to the margin of the valves 

 is of a reddish orange. 



Fig. 4. Pholas Candida, 



Shell oblong, muricate on all sides with decus- 

 sate striae. 



Lister Conch, tab. 435. fig. 278. 



Specimen white, very thin, within smooth, and 

 rather silvery, both ends rounded; tooth of the 

 hinge long, thin, and curved ', margin of the hinge 

 turgid, and projecting with a sharp curved fold 

 towards the anterior part. One accessory valve 

 lanceolate. 



Inhabits the English coast. 



PLATE IV. 

 Fig. I. Hinge of Mya truncata. 



