of the North of Ireland. 89 



profusion on Zostera and Alga, at low water mark and a few fathoms depth. 

 Dead on the Turbot Bank and elsewhere. 

 var. interrupts. Common around the coast— Thompson (R. interrupta). 

 Rlssoa inconspicua, Alder. 



" One specimen at Bundoran, Mrs. Hancock " — Thompson. Frequent on 

 the Turbot Bank— Hyndman. 

 Rlssoa albella, Loven. 



Turbot Bank; from Hyndman's collection — Belf. Mus. Coll. I find no 

 note of it in Hyndman's Reports. If the determination of the species be 

 correct, the specimens probably belong to the variety Sarsii, which is abun- 

 dant along the west coast of Scotland ; the typical form is confined to Bantry 

 Bay, according to Jeffreys. 

 Rissoa membranacea, Adams. 



" Bundoran, Warren. On muddy banks, witbin and below low water, it 

 is common and fine in Belfast Bay" — Thompson, who remarks that he is 

 informed that this species lives on the leaves of the " sleech-grass " (Zostera 

 marina), and never, like other Rissoce, on Faci. A common species, living on 

 Zostera banks throughout the district. Dead on the Turbot Bank, and in 

 deep water in and outside of Strangford Lough — Hyndman, and Dickie. (R. 

 labiosa by all). 

 Rissoa violacea, Desmarets. 



Bangor, Belfast Bay — Thompson. " Living, scarce, on sea-weed between 

 tide-marks" — Hyndman. Dead, common, Castle Ward Bay, Strangford 

 Lough — Dickie. (All sub R. rufilabrum) . It is one of the two North of Ireland 

 Rissoce which alone are not recorded from the Turbot Bank. 

 Rissoa striata, Adams. 



This tiny shell swarms around our shores, on sea- weeds, stones, and mud, 

 between tide-marks. Common also, in a dead state, in up to 30 fathoms of 

 water on the Antrim and Down coasts. 

 Rissoa proxima, Alder. 



"Magilligan (W.T.) ; Bundoran (Mrs. Hancock) " — Thompson. Turbot 

 Bank, very rare — Hyndman. It is a rare and critical species, and as it has a 

 southern distribution, and Dublin is the most northern station given by 

 Jeffreys, it is possible that Thompson's localities belong to the following 

 species. 

 Rissoa vitrea, Montagu. 



Turbot Bank, extremely rare — Hyndman. 

 Rissoa fulgida, Adams. 



"I have found it sparingly at Lame Lough, near Belfast " — Jeffreys. 

 Rissoa soluta, Philippi, 



In Turbot Bank sand, very rare— Hyndman. Specimens from thence are in 

 the Belfast Museum Collection. 



