Report on the Crustacea Schizopoda of Ireland. 243 
Macromysis inermis (Rathke). 
Not in the Survey Collection. 
Marine Laboratory. —Inisbofin Harbour, 4th and 5th August, 1899, surface 
townet at night. Young examples, apparently referable to this species. 
Trish Record.—Valentia Harbour (A. O. 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; Murman Sea; Spitzbergen (A. M.N.*): 
Heligoland (Khrenbaum). 
Genus Schistomysis, Norman. 
Schistomysis spiritus, Norman. 
Survey.—Station 115, off the Skelligs, 62 to 52 fathoms, mud and sand. August 
20th, 1890. 
Station 223, Loughrosmore Bay, Co. Donegal, 9 to 4 fathoms, sand. May 
21st, 1891. 
No Previous Irish Record. 
Distribution.—Shetland; Durham; Banff; Firth of Forth; Jersey (A. M. N.*): 
Plymouth (W. Garstang !): Irish Sea, Puffin Island (A. O. 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 10mm. (and in one of 12 mm. from Plymouth) 
the spines are still less dense than in the adult, but have the characteristic arrange- 
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 
21st, 1890. 
Station 12a, inside the Nymph Bank, off Ballycottin, 41 fathoms, sand. 
August 28th, 1890. 
Station 130, Kenmare 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 I. flexuosa from Christiania Fjord, 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. 
