AVICULA. 

 Fig. . , 



15. A. tarentina, Lamk. — Mi/tihis and Avicula hirundo, etc. — Ban- 



try Bay, Devon, etc., R. 



Pinna. 



16. P. pectinata, Linn. — P. fragilis, muricata, ingens, lavis, papy- 



racea, rohmdata, elegans. — Dorset, Milford Haven, Hebrides, 

 Cape Clear ; deep water, Mc. 



Ostrea. 



17. O. edulis, Linn. — 0. vulgare, etc. — Various natural and artificial 



beds, in England, Scotland, and Ireland. The common Oyster. 



Anomia. 



18. A. ephippium, Linn. — A. electrica, A. squamula, cepa, etc. — Brit. 



co. generally, 1 to 30 fath., C. Pearly and irregular ; beak margi- 

 nal, curved. 



19. A. acdleata, Mutter. — A. striolata. — Brit. co. generally, Mc. 



Small, with spinous sculpture. 



20. A. striata, Loven. — Hebrides, R. Rayed, striated, with apex not 



marginal. 



21. A. patelliformis, Linn. — A. undulata. — Cape Clear, etc., 1 to 



50 fath., Mr. Plat, ribbed. 



Lima. 



22. L. subauricttlata, Montagu, (Pecten.) — L. nivea, sulcata, etc. — 



Plymouth, Man, Zetland, Belfast, etc., Mr. Nearly straight. 



23. L. hians, Gmel. (Fitraa.) — L.tenera, fragilis, a/perta, etc. — Chan- 



nel Isls., Penzance, Oban, Belfast, etc., Mc. Oblique, gaping 

 at sides. 



24. L. Loscombii, Sowerby. — Pecten and Ostrea and Lima fragilis and 



bullata. — Many Brit, loc, 10 to 50 fath., Mc. Oblique, closed 

 at sides. 



