14 



*P. LAMELLATA. Flern. Brit. An., p. 456. Numerous 

 in a reddish sandstone, from deep water, drawn up by a 

 fisherman's hook. Mr. Bellamy says it is not uncommon 

 at Plymouth. 



GASTROCHiENA. 



GENERIC CHAR A CTER: The shell bivalve, the valves 

 equal, rather wedge shaped, gaping very much; the an- 

 terior aperture large, oval, oblique; scarcely any aperture 

 posteriorly. Hinge, linear, marginal, without teeth. 



G. HIANS. My a Dubia. Turt. Lin. Pen. Brit. Zo., 

 vol. 4, pi. 44, fig. 19. M. Pholadia. Mont. Test. Brit., 

 vol. 1, p. 28. G. H. Flem. Brit. An., p. 458. Scarce. 

 I have seen it taken alive from the cavity of a stone from 

 deep water. 



SOLENACEA, 

 The Shell transversely elongated, gaping only at the 



lateral extremities. Ligament external. Accessary pieces 



none. 



SOLEN. 



GENERIC CHARACTER: Shell bivalve, the valves 

 equal, transversely elongated, gaping at both endsj beaks 

 small, not projecting. Ligament external, near the hinge. 



* S. SILIQUA. Turt. Lin. Pen. Brit. Zo., vol. 4, pi. 45, 

 fig. 20. Mont. Test. Brit., vol. 1, p. 46. Stew. Elem., vol. 

 2, p. 369. Flem. Brit. An., p. 459. Razor &$,ell. From 

 the specimens and fragments found lying on the shore, 

 this animal seems not uncommon; but several circum- 

 stances render it not easy to be found in its living state. 



S. PELLUCIDUS. Turt. Lin. Pen. Brit. Zo., vol. 4, 

 pi. 46, fig. 23. Mont. Test. Brit., vol. 1, p. 49. Flem. 

 Brit. An., p. 459. Rare ; and the more so, that it must be 

 taken alive, to be obtained perfect. Montagu obtained it 

 in Cornwall, and I possess a soecimen from Ireland. 



S. DECLIVIS. Flem. Brit. An., P . 460. Dr. Fleming, 

 who is the only authority for this shell, reports it as occur- 

 ing in the Scilly Islands. 



S. ANTIQUATUS. S. Cultellus. Pen. Brit. Zo., vol. 4, 

 pi. 46, fig. 25, but not of Linneus ; S. A. Mont. Test. Brit., 

 vol. 1, p. 52. Flem. Brit. An., p. 52. Rare. Montagu 

 obtained a specimen near Looe ; and it has been found at 

 Gorran by Mr. Peach. 



MYARIA. 

 Ligament internal ; one iarge spoonshaped tooth, in one 



or both valve.*, to the cavity of which the ligament is attached. 



Shell gapiDg at one or both of its sides. 



MYA. 

 GENERIC CHARACTER: Shell bivalve, transverse, 

 gaping at both ends; with one large cardinal tooth in the 



