WARREN : MARINE MOLLUSCA OF KILLALA BAY, IRELAND. 99 



Anomia ephippium L. Common at low-water on stones, 

 and Laminaria roots. The var. aadeata I liave found 

 more frequently on the roots than on stones. 



Ostrea edulis L. Moyne, at the Mayo side of the Bay, is 

 the only locality where I know the Oyster to be living. 



Pecten puslo (L.). I have found this shell occasionally near 



Enniscrone. 

 P. varius (L.). 

 P. opercularis (L.). 



P. tigrinus Miill. Only three single valves, Enniscrone. 

 P. maxim US (L.). After storms cast up alive on the sandy 



shores of Bartra and Enniscrone. 



Lima subauriculata (Mont.). A valve. 



Mytilus edulis L. Swarming in every suitable place. 



M. modiolus L. 



M. barbatus L. Occasionally. 



M. phaseolinus (Phil.). Rare on this coast. I have only 



found two alive and nesting in the Corallina officinalis that 



fringes the rock-pools at Carrahubbuck. 

 Modiolaria marmorata (P'orb.). Rarely found in shell-sand. 

 M. costulata (Riss.). Rather abundant in some rock-pools at 



Carrahubbuck, nesting in C. offici?ialis, also in Chondnts 



crispus, though more rarely. 

 M. discors (L.). Same as the last, though making its nest 



nearer the roots of the sea-weed than M. costulata. 

 Nucula nucleus (L.). Occasionally in the debris amongst the 



rocks at Carrahubbuck. 

 Area tetragona PoH. Single valves are of frequent occur- 

 rence, and one perfect specimen has been met with. 

 Lepton nitidum Turt. 

 L. clarkiae Clark. Enniscrone and Bartra. 

 Montacuta substriata (Mont). Valves only in shell-sand, 



Enniscrone. 



