LAMELLIBRANCHIATA. 353 



P. perforans, Br. 



" Portmarnock, and in stones at Howth." Brown. 



A common species, on sandy beaches, near to and below low-water 

 mark, as well as the following form or species. Inhabits the exjoosed 

 coasts of Antrim and Down, as well as the bays ; the P. perforans being 

 apparently the more common in such localities. Found within apertures 

 in indurated clay with P/iolas catulidus and P. dactylus ; at Carrickfergus 

 in apertures in limestone ; and in Belfast Bay and elsewhere. Ballysodare, 

 Mrs. Hancock. 



P. vulgaris, Sow. 



" Dublin Bay and Portmarnock, plentiful." Br. Turt. 



What is said of localities under the last species equally applies to this. 

 In addition, Lahinch (Co. Clare) and Killery Bay may be named 

 (W. T., &c.). 



P. decussata, Br. Dublin coast, Br. 



A common species ; near to and below low-water mark. Coast of Louth 

 (W. T.) ; Ballysodare (of large size and highly coloured ; plentiful, Mrs. 

 Hancock). Clifden and Killery Bays, W. T., &c. 



P. rirffiiiea, Br. Bray ; Portmarnock, Br. Turt. 



A common species. Dredged in Belfast and Strangford Loughs, chiefly 

 from about 10 to 20 fathoms, on sand and mud. Ballysodare, Mrs. Han- 

 cock. Clew and Killery Bays, AY. T., &c. In a lake, brackish water, 

 largest South Isles of Arran (Arranmore), Dr. R. Ball and W. T., 1834. 



Var. T^. Sarniensis, Turt. Brit. Biv., is taken in Belfast Bay, on the 

 Dublin and southern and western coasts. 



Genus Venerupis. 

 V. Irus, Linn. 



" At Miltown Malbay this shell always inhabits sponges or sea-weeds ; 

 often the roots of Laminaria bidbosa." Professor W. H. Harvey. Dr. 

 Farran mentions his finding a V. Irus on the exposed granite rocks at 

 Birterbuy Bay, to which it moored itself by strong thi'eads similar to 

 those of the byssus of the mussel. 



Ge?ius Petricola. 

 P. ochroleuca, Lam. 



Bantry Bay, Miss Hutchins ; Dr. Turton, Br. Turt., Dublin (sub- 

 fossils) and Valentia added in Turt. Brit. Biv. Found alive at Bantry 

 Bay by Mr. Warren, and dredged quite recent (the animal dead within 

 the shell) in Bii'terbuy Bay by Dr. Farran. Not uncommon in a deposit 

 of blue clay in Dublin Bay, where it was found many years ago by Mr. 

 Furlong (O'Kelly, in Penn. Brit. Zool.). In 1840 I procured it there 

 from the same material brought up from a depth of several feet. Ard- 

 more, Mrs. Mackesy. 



Family Pylorid^. 



Genus Corbttla. 



C. striata, Flem. Dublin coast, Br. Turt. 

 Although found on each side of the coast, not gcnerallv distributed ; 



2 A 



