318 MOLLUSCA. 



sent me specimens from Rounclstone in 1840, stating that they were found 

 on Pecte7i maximus, di'edged 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, Galwav 

 coast, in Oct., 1840, by Mr. M'Calla. Mr. Alder describes it : " Shell 

 thick, conical, opaque, of a dull dirtyish white, with five fiat 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 fiat- 

 tened in the middle, having strong coarse stria; 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 1^ tenth 

 of an inch ; breadth nearly 1 tenth." 



In a paper by Loven, on the genus Turhonilla, Leach, published in 

 1846, he adopts Odosf. crassa. Thompson describes and figures it, and 

 gives as "hab. in Pectine, maximo, Bahusie." 



Genus Skenea. 



iS". depressa, Mont. Bantry Bay, Turt. C. D. 



I have taken this species in abundance on the fresh leaves of Zostera 

 maritui, at Strangford Lough, and on the same plant and ak/ce 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 hei'e, this species has been 

 met with in quantities, as noticed in the Ann. N. Hist., vol. ii. 3<54. Bun- 

 doran, jSIr. Warren. 



