of the North of Ireland. 89 
profusion on Zostera and Algos, at low water mark and a few fathoms depth. 
Dead on the Turbot Bank and elsewhere. 
var. interrupta, Common around the coast — Thompson (R. interrupta). 
Rlssoa ineonspicua, Alder. 
“ One specimen at Bundoran, Mrs. Hancock ” — Thompson. Frequent on 
the Turbot Bank — Hyndman. 
Rissoa 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 he 
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 hanks, within 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 Fuci. A common species, living on 
Zostera hanks 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. 
3£issoa vitrea, Montagu. 
Turbot Bank, extremely rare — Hyndman. 
Siissoa fulglda, Adams. 
“ I have found it sparingly at Larne Lough, near Belfast ” — Jeffreys. 
Rissoa soluta, Philippi . 
In Turbot Bank sand, very rare — Hyndman. Specimens from thence are in 
the Belfast Museum Collection. 
