318 
MOLLUSCA. 
sent me specimens from Roundstone in 1840, stating that they were found 
on Pecten maximus, dredged from 18 fathoms, muddy bottom. The follow- 
ing species was found with them : — 
O. plicata, Mont. Dublin Bay, Turton, C. D. 
Although indicated from the four sides of the coast, I have seen but 
very few examples of this species. It has been found in Belfast Bay and 
Strangford Lough by Mr. Hyndman and myself ; at Portmarnock, by Mr. 
Warren ; at Bundoran, by Mrs. Hancock ; and on the South-West coast, 
about Bantry Bay, by Mr. M‘Andrew ; Ardmore, Mrs. Mackesy. 
O. spiralis, Mont. (W. T., Ann. N. H., xiii. 432.) 
Very sparingly, in shell-sand collected at Magilligan, by Miss Moody ; 
and at Portmarnock, by Mr. Warren. 
The Bundoran habitat is not altogether certain. 
O. interstincta, Mont. (W. T. as last.) 
Portmarnock as last, included together with O. pallida in Mr. Barlee’s 
list of shells obtained at Birterbuy Bay. 
O. cylindrica , Alder. (W. T., Report, &c., and Ann. N. H., xiii. 432.) 
One specimen was obtained from shell-sand collected at Bundoran by 
Mrs. Hancock. 
O. obliqua, Alder. 
Two specimens obtained with the last. 
O. crassa, Thompson. 
Of this shell a single specimen was sent me from Roundstone, Galway 
coast, in Oct., 1840, by Mr. M‘Calla. Mr. Alder describes it : “ Shell 
thick, conical, opaque, of a dull dirtyish white, with five flat whorls, the 
last occupying about two-thirds of the shell. The apex is slightly ob- 
lique, the upper whorls smooth, the last rugose, bulging, and rather flat- 
tened in the middle, having strong coarse striae crossed by indistinct 
lines of growth. Aperture ovate, white and polished internally ; outer 
lip thick, acute at the edge ; inner lip reflected on the pillar with a deep 
impression behind it ; but no umbilicus. Tooth strong. Length li tenth 
of an inch; breadth nearly 1 tenth.” 
In a paper by Loven, on the genus Turbonilla, Leach, published in 
1846, he adopts Odost. crassa. Thompson describes and figures it, and 
gives as “hab. in Pectine, maximo, Bahusie.” 
Genus Skenea. 
S. depressa, Mont. Bantry Bay, Turt. C. D. 
I have taken this species in abundance on the fresh leaves of Zoster a 
marina, at Strangford Lough, and on the same plant and algce it is com- 
mon in Belfast Bay. In the stomachs of grey mullet, which fish feeds on 
the very minute Mollusca of the ooze banks here, this species has been 
met with in quantities, as noticed in the Ann. N. Hist., vol. ii. 354. Bun- 
doran, Mr. Warren. 
