164 Eev. Canon A. M. Norman on British Mysidae. 



peduncle of the antennules ; greatest breadth central, about, 

 or rather more than, equal half the length, setose all round.' 

 Telson somewhat shorter than the uropods, contracted at one 

 third its length, the portion posterior to the constriction being 

 narrow ; extremity narrowly truncate, with a well-developed 

 spine at each corner (but no central spines) ; marginal spines 

 8-10, the first three or four separated by an interval from the 

 following. Inner uropods narrow, a single spine on the inner 

 margin opposite the otolithic process ; otolithic area occupying 

 scarcely more than one third of the total length. Length 

 about 14-15 millim. 



Hah. Forty miles off Tynemouth, Northumberland ; Shet- 

 land ; Firth of Clyde; off Valentia, Ireland {A. M. N.) ; 

 Moray Firth; Firth of Forth, near May Island; Tarbert, 

 Loch Tyne {T. Scctt) : Mus. Nor. 



Distribution. Norway, in Chrlstiania and Hardanger 

 Fiords, Aalesund, Christiansund, and Lofoten Islands, 30- 

 150 fath. (G. 0. Sars) ; Denmark {Meinert). 



2. Mysidopsis gibbosa, G. 0. Sars. (PL X. fig. 8.) 



1864. Mysidopsis gibbosa, G. O. Sars, Zool. Reise 1863 i Christiania 



Stift, p. 28. 

 1872. Mysidopsis gibbosa, G. 0. Sars, Monogr. Mysider, ii. p. 23, pi. viii. 



figs. 1-13. 

 1883. Mysidopsis gibbosa, Czerniavsky, I. c. fasc. iii. p. 24. 

 1885. Mysidopsis gibbosa, Carus, I. c. p. 469. 

 1887. Mysido^Jsis gibbosa, Norman, Ann. & Mag. Nat. Hist. ser. 5, 



vol. xix. p. 93. 



A much smaller species than the last. 



Body robust, the pleon generally curiously bent upwards 

 in the middle. Rostrum very small, scarcely developed. 

 Antennal scale narrowly elongate-ovate, about three times as 

 long as broad, rather more than half as long again as peduncle 

 of antennai, and about one third longer than peduncle of 

 antennules, setose all round. Telson broader throughout 

 than in last species, and distally more broadly truncated ; this 

 truncated extremity is furnished with two (rarely three) 

 small spines in the centre, but none at the angles; lateral 

 spines 11-18, no marked interval between the first three or 

 four and the following. Inner uropods only slightly longer 

 than the telson, scarcely more than twice as long as the 

 otolithic area, 4-5 small spines within inner margin near the 

 base, opposite the acoustic organ. Length about 6-7 millim. 



Hab. Valentia. Ireland, 1870 {A. M. N.) ; Tarbert, 

 Loch Fyne, 1885; and Firth of Forth, 1888 (7^. Scott): 

 Mus. Nor. 



