CO^CRYUX—DITHYRA. 34. J 33 



34. MYRTEk—TURTON. 



Testa ovato-trigona, (squivalvis, suhtequilxiieralis, clausa. 



Cardo vah'fe alterius dente unico cum laterali titrinque ; 



alterius dentibus dnobus, lateralibus obsoletis. Ligamentum 



externum. 

 Shell oval-triangular, equivalve, nearly equilateral, closed. 



Hinge of one valve with a single tooth and lateral one each 



side ; of the other valve with two teeth, the lateral ones 



obscure. Ligament external. 



From the structure of the hino:e in this shell, it cannot be 



s?^ 



included in any of the genera into which the original Venus 

 tribe is now divided, without a latitude of character inconsistent 

 with the precision of classical arrangement. 



We have examined a very tine pair, taken from the stomach 

 of a large sole; and they exactly correspond with the description 

 and figure of Montagu. 



MyRTEA. spinifei-R. 



Venus spinifera. Montagu, p. 577, tab. 17, fig. 1. 



Pennant, Brit. Zool. iv. p. 201. 



Linn. Trans, viii. p. 78. 



Turton, British Fauna, p. 160. 



Dillwyn, Descript. Catal. p. 163. 



Turton, Conch. Diet. p. 231. 

 On the Western coasts ; very rare. 



