of the North of Ireland . 
87 
more so ” — Thompson {sub X. quadrifasciata ) . “ Common on laminaria ” — 
Hyndman (sw£ X. vincta). Abundant in Turbot Bank sand, in a dead state. 
Xiacuna puteolus, Turton. 
Apparently rare. Dredged by Hyndman, in a dead state, on the Turbot 
Bank, and near Ballygalley Head. Strangford Lough — Mr. S. A. Stewart. 
Bundoran — Belf. Mus. Coll. 
var. conica. “ Co. Antrim (Hyndman)” — Jeffreys. 
Xiacuna pallidula, Da Costa. 
“ Inhabits the laminarian region in Belfast and Strangford Loughs, and 
chiefly found on the broad fronds of Laminaria digitata ; also on oysters ; 
occurs hut sparingly ; procured in some quantity at Ballycastle by the Bey. 
Thomas Hincks ” — Thompson. “Living, common, on Laminaria ” — 
Hyndman. Magilligan — Belf . Mus. Coll. 
Xiittorina obtusata, Linne. 
Abundant on stones and Fuci on all beaches. Hyndman dredged dead 
shells on the Turbot Bank (X. littoralis). “ Common around the shores” — 
Thompson (X. Neritoides , Forbes). 
var. neritiformis. “Captain Brown has given Downpatrick as an Irish 
locality ” — J effreys . 
var. fabalis. “ I have found it plentifully at Larne in the North of Ireland. 
I believe it represents the young males of the ordinary form ” — Jeffreys. 
Xiittorina neritoides, Linne. 
On rocks and stones above high water mark; common. Bundoran — 
Thompson (X. petrcea, Mont.). 
Xiittorina rudis, Maton. 
Plentiful on stony beaches everywhere. 
var. saxatilis. “ North of Ireland ” — Thompson (X. saxatilis). 
var. jug-osa. “Is common on all quarters of the rocky coasts ’’—Thompson 
(L. jug os a). 
var. patula. “ Living, common, on rocky ground a little below high water 
mark” — Hyndman (X. patula). Is this correct? Jeffreys gives only three 
stations in Britain — Eddystone, Penzance, and Unst. 
var. tenebrosa. “Although met with on all sides of the coast, it is local” 
— Thompson (X. tenebrosa). It is an estuarine form, and occurs on our 
Zostera hanks. Larne Lough — Hyndman. Fair Head — Belf. Mus. Coll. 
Xiittorina litorea, Linne. 
In the greatest abundance on stones and mud hanks. “Abundant round 
the shores of the Island” — Thompson (X. communis , Turt. Br.). 
var. turrita. Belfast Lough, Mr. S. A. Stewart — Belf. Mus. Coll. 
Genus Rissoa, Freminville. 
Of this large genus of tiny shells, out of the 25 species which Jeffreys in- 
