2-44 Holt &, Beaumont — Sitrven of Fishing-firoimds, W. Coas^t of Ireland, 1890—91. 



Station 148, seven miles S.S.W. of Grregoiy Sound, Aran, 38 fathoms, sand. 

 April 9th, 1891. 



Marine Laboratory. — Blacksod Bay, 6— 8 fathoms, 29th March, 1899. Numerous 

 examples, divergent in some characters from the type. We have observed the 

 same peculiarity in specimens from the estuary of the Tamar, and propose to 

 revert to the matter on a future occasion. 



Previous Irish Bccords. — Off Valentia (A. M. N.*) : Port Magee entrance, 

 Valentia Harbour, 15 fathoms (A. O. W.*). 



Distribution. — Shetland; east Scotland; Durham; Liverpool Bay (A. M. N.*): 

 Irish Sea (A. 0. AV.) : Dogger Bank (T. S.): off Plymouth and Tamar estuar3\ 



Norway ; Denmark ; Holland ; N. W. France (A. M. N.*) : Baltic, North Sea 

 (Ehrenbaum). 



Scliistomysis arenosa (CI. 0. Sars). 



Not in the Survey Collection. 



Marine Laboratory. — Off the White Strand, Ship Sound, Inisbofin, 2-5 fathoms, 

 20th and 22nd July, 1899, very abundant. 



No Previous Irish Record. 



Distribution. — Starcross, Devon (A.M.N.*): Plj-mouth (W. Garstang!): 

 Mediterranean (A. M. N.*). 



Genus Mysis, Latreille. 

 Mysis relicta, Lov^n. 



Museum, Dublin. — Lough Neagh, near mouth of Antrim river, per Dr. R. F. 

 Scharff. 



Previous Irish Record. — Lough Neagh (A. M. N.*). 3Iysis chamwleon, recorded 

 by Bell, on the authority of W. Thompson, from the stomachs of pollen in Lough 

 Neagh, can only be referable to this species. 



Distribution. — Lakes Venern, Vettern, Malar, etc., Sweden; Lake Mjosen, 

 Norway; Lake Onega, Russia; Lake Ladoga, Putko, etc., Finland; northern 

 part of Gulf of Bothnia; Lakes Michigan and Superior, in America (A. M. N.*). 



Lough Neagh appears to be regarded by geologists as due to a comparatively 

 late subsidence of the basalt of the Bann valley, but the exact period is disputed. 

 It may be presumed that 31. relicta did not enter the Lough by the navigation 

 canal ; it certainly cannot have ascended the Bann, which is in places much too 

 rapid to permit of such an achievement. The most closely allied marine species 

 is M. ocidata, the sub-Arctic habitat of which is perhaps of some importance in 

 considering the age of the Lough. 



