ERVILIA. 341 



the same spot, he has never procured a second example we think it 

 most probahle that the shell came from some foreign vessel. 



ERVILIA, TuRTON. 



Shell more or less solid, equi valve, inequilateral, oblong, 

 depressed, closed. Surface transversely striate or nearly 

 smooth. Two diverging- teeth in each valve, one of them 

 in the right valve high and projecting : a cartilage pit in 

 each for the reception of the connecting internal cartilage. 

 No lateral teeth. Muscular impressions strong; pallial 

 sinus large and broad. 



Animal unknown. 



This genus, which was constituted by Turton for the 

 Mi/a nitens of Montagu, has lately been revised and re- 

 defined by E-ecluz.* It has considerable relations with 

 Mesodesma, but until the animal shall have been observed, 

 its true position can only be assigned by analogy, as indi- 

 cated by the shell alone. The species here described are 

 all which have as yet been enumerated as members of the 

 group. 



E. CASTANEA, MoutagU. 



Plate XXXI. figs. 5, 6. 



Doriax castanea, Mont. Test. Brit. p. 573. — Linn. Trans. voL viii. p. 77. — Turt. 



Conch. Diction, p. 42. — Dillw. Recent Shells, vol. i. p. 152. 



— Index Testae, pi. 6, Donax, f. 10. 

 Capsa casianea, Turt. Dithyra Brit. p. 128, pi. 10, f. 13. — Flem. Brit. Anim. 



p. 434.— Brown, 111. Conch. G. B. p. 96, pi. 39, f. 12. 

 Mesodesma castanea, Brit. Marine Conch, p. 54. 

 Ervilia castanea, Recluz, Mag. de Zool. 1845, pi. 95. — Recluz, in Chenu 111. 



Conch. Ervilia, p. 3. 



The shape of this interesting and rare shell, erroneously 

 placed by Dr. Turton in the genus Capsa (which has a 

 * Revue Zoologique par la Soc. Cuvierienne, March, 1844. 



