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 exposed 
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 Pholas Candidas 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 
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. virginea , 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, W. T., &c. In a lake, brackish water, 
largest South Isles of Arran (Arranmore), Dr. R. Ball and W. T., 1834. 
Var. V. 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 bulbosaP 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 threads similar to 
those of the byssus of the mussel. 
Genus PETRICOLA. 
P. ochroleuca, Lam. 
Bantry Bay, Miss Hutchins; Dr. Turton, Br. Turt., Dublin (sub- 
fossils) and Yalentia added in Turt. Brit. Biv. Found alive at Bantry 
Bay by Mr. Warren, and dredged quite recent (the animal dead within 
the shell) in Birterbuy 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^e. 
Genus Corbula. 
C. striata , Flem. Dublin coast, Br. Turt. 
Although found on each side of the coast, not generally distributed ; 
