Report on the Crustacea Schizojwda of Ireland. 243 



Macromysis inermis (Rathke). 



Not in the Survey Collection. 



Ilarine Lahoratorij. — Inisbofin Harbour, -itli and 5th August, 1899, surface 

 towuet at niglit. Young examples, apparently referable to this species. 



Irish Record. — Valentia Harbour (A. 0. W.*). 



Distribution. — Shetland ; east and west coasts of Scotland ; Northumberland ; 

 Plymouth (A. M. N.*) ; North Wales ; Isle of Man (A. O. W.). 



Norway; Sweden; Denmark; Baltic; Murmau Sea; Spitzbergen (A. M.N.*) : 

 Heligoland (Ehrenbauni). 



Genus Schistomysis, Norman. 

 Schistomysis spiritus, Norman. 



Survey. — Station 115, off the Skelligs, C2 to 52 fathoms, mud and sand. August 

 20th, 1890. 



Station 223, Loughrosmore Bay, Co. Donegal, 9 to 4 fathoms, sand. Slay 

 21st, 1891. 



No Previous Irish Record. 



Distribution. — Shetland; Durliam; Banff; Firth of Forth; Jersey (A. M. N.*) : 

 Plymouth (W. Garstang !) : Irish Sea, Puffin Island (A. 0. W.). 



Norway; North Sea; Denmark; Holland; Boulonnais, France (A. M. N.*). 



The gathering from Station 223 contains a specimen of 10 mm., and a num- 

 ber of smaller immature forms. The spines of the inner uropod, in the latter, are 

 comparatively few in number and consequently much less crowded than in the 

 adult condition. In the specimen of 10 mm. (and in one of 12 mm. from Plymouth) 

 the spines are still less dense than in tlie adult, but have the characteristic ai'range- 

 ment. Other characters, which need not be detailed, leave no doubt as to the 

 specific determination. 



Schistomysis ornata (G. O. Sars). 



Survey. — Station 118, Ballinskelligs Bay, 32 to 28 fathoms, soft mud. August 

 2 1st, 1890. 



Station 121rt, inside the Nymph Bank, off Ballycottin, 41 fathoms, sand. 

 August 28th, 1890. 



Station 130, Keumare River, off Sneem, 24 fathoms, mud. March 30th, 1891. 



covered by Sars' diagnosis (20 ca.). We have compared the otolith of the larger specimen of each sex 

 with that of a M.flexuosa from Christiania Tjord, and are unable to detect any proportional difference in 

 size. In so far as concerns the characters of the antennal scales, and of the cleft of the telson, the 

 determination appears to be in harmony with the descriptions of the two species. 



