MARINE M0LLUSCA OF DONEGAL AND DUBLIN. 53 



Class Conchifera. — Order Lamellibranchiata. 



Anomia ephippium, Linnaeus. — Dublin: frequent, Howth, 

 Portmarnock, &c. Donegal : abundant on the upper parts of 

 Lough Swilly, as at Fahan and Inch ; frequent westward in the 

 county. 



A. patelliformis, Linn.— Dublin : Portrane and Portmarnock. 

 Donegal : Lough Swilly, with the last. 



Ostr&a edulis,Jjinn. — Dublin: Malahide, Clontarf, and Howth. 

 Donegal : Lough Swilly, at Inch and Castlewray. 



Pecten pusio, Linn.— Dublin, frequent; I have gathered living 

 specimens after heavy storms at Portmarnock. Donegal, frequent 

 round the coasts. 



P. varius, Linn. — Dublin, Donegal, frequent. 



P. operadaris, Linn. — Dublin, Donegal, common. 



P. tigrinus, Miill. — Dublin : I have dredged valves of this 

 dead, at Ireland's Eye ; on the beach at Portmarnock near the 

 Point ; formerly found there double (Miss Willan). Derry : Miss 

 Galway has gathered single valves at Magilligan. 



P. septemradiatus (P. danica, Miill.).— Derry : Magilligan, a 

 single valve (Miss Galway). 



P. maximus, Linn. — Dublin and Donegal, common; rarely 

 occurs as a drift shell. Off the coast of Down many are trawled. 



Lima hians, Gmelin. — Donegal : plentiful at Moross Ferry, 

 Mulroy, especially on the " Between -water" side, where I have 

 gathered specimens, in 1888, at low-water beside the boat-slip. I 

 have taken it also on the Fanet side of the ferry. The bottom is 

 weedy, with much Zostera, and the tide of the lough, owing to 

 the narrow entrance, is very slight. 



Pinna rudis, Linn. — Wexford, Tuscar Eocks. I have obtained 

 specimens (some of them very fine) from the Dublin Bay trawlers. 

 They were obtained from the Tuscar Rock, and also from off the 

 coast of Down. 



Mytilus edulis, Linn. — Common on all coasts. 



M. modiolus, Linn. — Dublin and Donegal, common. 



M. adriaticus, Lamarck. — Dublin : Portrane, scarce. Donegal : 

 Kinnegar strand, near Rathmullan, on Lough Swilly, rare. 



Modiolaria {Crenella) marmorata, Forbes. — Dublin, a few 

 specimens amongst shingle at the " Ware Hole," Drumleck, 

 Howth ; Portmarnock, scarce. Wexford : common on the shores 



