LAMELLIBRANCHIATA. 
349 
(and Dr. Farran makes the same remark with respect to Birterbuy Bay) 
we found it generally within dead bivalves. 
K. rubra , Mont. 
Among mussels ( Myliti ) on the shores of the Skerries, islands off Port- 
rush ; and about the roots of growing sea-weeds between tide-marks. 
Belfast Bay ; Wicklow coast, W. T. In shell-sand sent me from Kilkee, 
Co. Clare. 
Genus Montacuta. 
Montacuta substriata, Mont, (sp.) 
Found on the purple urchin ( Spatangus purpureus ), dredged from 
25 fathoms, at the entrance of Belfast Bay, by Mr. Hyndman, in May, 
1842. 
M. bidentata, Mont. 
“ Imbedded in the hack of old oyster-shells about Cork and Dublin 
Bay,” Turt. Catal. Bangor, Belfast Bay (one specimen), 1834, Mr. 
Hyndman and W. T. Bundoran, Mr. Warren. 
M. ferruginosa , Mont. 
Dublin coast, Turt. Whence only have I yet seen specimens. Several 
specimens taken in fine sand from thirty fathoms betw r een Baltimore 
Harbour and Cape Clear, by Mr. M‘Andrew, who adds, “ frequent in 
company with fine living specimens of JEulima subulata” 
M. ovata. 
Specimens of this shell from the southern coast are in Mr. Hyndman’s 
cabinet, as are some in Mr. Warren’s from Portmarnock sands. Several 
found on the beach at Bundoran by Mrs. Hancock. 
M. purpurea , Hanl. 
In profusion about the roots of plants growing on rocks accessible at 
low-water, and also on the leaves of those growing on the oozy banks of 
Belfast Bay : the shoals of mullet {Mugil chelo ) consume vast quantities 
of them when roving over these banks, feeding in spring and summer. 
Larne Lough ; Dublin Bay, W. T. From the coast of Clare, in Mr. 
Warren’s collection. 
Genus Cyclas. 
C. cornea , Lam. 
Commonly distributed over the island, occurring in small ponds, &c., 
as well as lakes and rivers, — the var. fi. of Jenyns and other varieties not 
unfrequent. In summer I find the C. cornea of all sizes, abundant in 
masses of Confervce, floating on the surface of the water. 
Cyclas lacustris, Turt. 
Is rare and local in Ireland ; occurs in the East and South. To Dr. It. 
Ball of Dublin I am indebted for specimens which were taken by him 
many years ago in a pond at Tallaght, a few miles from the metropolis ; 
