614 Proceedings of the Royal Irish Academy. 



Family. — Osteeid^. 

 Ostrea eclidis, Liune. 

 i., ii., iii., iv., v., vi. 

 Abundant in suitable localities round tlie coast, from low-water 

 mark to about 50 fms., and usually gregariou.s. 



Bistrilution. — Iceland. Norway to Mediterranean. Mogador. 

 ^N". E. America. 



Ostrea cochlear, Poll. 



. . . iv., . . 



iv, "Porcupine" Exp., 1869, 85-110 fms. (Jeffreys, '79). 



Distribution. — S. "W. Ireland to Mediterranean. "W". Africa,, 

 " Talisman" (Locard). Madeira. Canaries. 



Family. — PECTiNiDiE. 



Pecten pu&io (Linne). 



i., ii., iii., iv., v., vi. 



Generally distributed on rocky coasts, oyster-beds, and old 

 bivalve shells, &c., from about 5 fms. to moderate depths. 



Distribution. — !N^orway to Mediterranean. Azores. Canaries. 

 N. W. and S. Africa. C. Yerd I. 



Pecten varius (Linne). 

 i., ii., iii., iv., v., vi. 



Common all round the coast from low-water mark to about 50 fms. 



Var. purpurea, Jeffreys. Cork Harbour (Humphreys, f . Jeffreys, 

 '63) : Bantry Bay (Barlee, f. Jeffreys, '63). Var. nivea, 

 Macgillivray. Kingstown, Dublin Bay, very rare (Walpole, 

 '53a) : Glengariff, Bantry Bay (Barlee, f. Jeffreys, '63). 



Distribution. — Norway to Mediterranean. C. Yerd L, " Talisman " 

 (Locard). 



Pecten pes-hdrcB (Linne). (P. septemradiatus, Jeffreys, B. C.) 



i., . . iv., [v.], . 



i. Specimens supposed to be from Lough Foyle were in Dr. Farran's 

 Coll. (Thompson, '56) : Magilligan, a single valve (Miss Galwey, 

 f. Hart, '92) : ? Turbot Bank, rare (Dickie, f. Hyndman, '58) : 

 Turbot Bank, 80 fms., a single valve (Hyndman, '60). 



