90 Praeger—The Marine Shells 



Rissoa semistriata, Montagu. 



" R. semistriata has come under my inspection in shell-sand from Magilligan 

 and Bundoran" — Thompson. On the Turbot Bank, rare — Hyndman. 

 var. pura. Observed in Turbot Bank sand by Mr. Jeffreys — Hyndman {sub 



var. alba). 

 Rissoa cingillus, Montagu. 



On all sides of the coast" — Thompson (R. cingilla). "Living, com- 

 mon, under stones near low water mark" — Hyndman. Dead shells in the 

 deeper water. 

 var. rupestris. "North-East coast, Mr. Hyndman and W. T., not rare" 



— Thompson. Turbot Bank, rare — Hyndman. 

 [Rissoa Bryerea, Montagu. 



" Among shell-sand from Magilligan, one procured by Mr. Hyndman " — 

 Thompson. This is Rissoina Bryerea, a West Indian species, stray examples of 

 which have been occasionally found at different places in the British Isles.] 

 [Rissoa dispar (Turbo dispar, Montagu). 



Thompson, quoting from Brown, says that this species has been met with 

 on the rocks near the Giant's Causeway. It is Littorina dispar, a West 

 Indian shell, and has no claim to be considered British.] 

 Hydrobla ulvse, Pennant. 



Swarming on Zoster a banks and muddy sands in all our bays and estuaries, 

 between tide marks. Dead on the Turbot Bank — Hyndman (Rissoa ulvoz). 

 In summer it is the chief food of the grey mullet. In winter various sea- 

 birds feed on it. 

 Barleeia rubra, Montagu. 



" Among sea- weed brought from Tory Island, off the north coast of Done- 

 gal, by Mr. Hyndman, in 1845, this species was found" — Thompson (sub 

 Rissoa rubra). "Bundoran, Co. Donegal (J.G.J.)" — Jeffreys. Specimens 

 from the latter station are in the Belfast Museum. 

 Jeffrey sia diaphana, Alder. 



"In shell- sand collected at Bundoran by Mrs. Hancock, in 1840" — 

 Thompson (sub Rissoa albella, Alder). 

 Skenea planorbis, Fabricius. 



This tiny shell abounds on Zostera and Algce between tide-marks. Abun- 

 dant in Belfast and Strangford Loughs ; Bundoran, Mr. Warren — Thompson 

 (sub S. depressa). Larne Lough — R.L1.P. Dead shells in Turbot Bank sand 

 — Hyndman. 

 var. trochiformis. Larne Lough — Jeffreys. This is the convex-spired 



variety mentioned by Hyndman in his 1859 Report. 

 Homalogyra atomus, Philippi. 



"Living on Zostera marina, shores of Larne Lough" — Hyndman (sub 

 JEuomphalus nitidissimus). "Donegal in Ireland (Warren)" — Forbes and 



