Kev. Canon A. M. Norman on British Mysidae. 165 



Distribution. Naples {A. M. N.), Adriatic [Prof. Glaus) ; 

 Norway (G. 0. Sars) : Mus. Nor. South and West Norway, 

 6-10 fath. {G. 0. Sars) ; Denmark {Meinert) ; Goletta, Malta, 

 Syracuse, Messina, Spezzia {G. 0. Sars). 



3. Mysidopsis angusta, G. O. Sars. (PI. X. fig. 9.) 



1864. Mysidopsis angusta, G. 0. Sars, Zool. Reise 18G3 i Christiania 



Stift, p. 30. 

 1870. 3It/sidopsis angusta, G. 0. Sars, Monogr. Mysider, p. 27, pi. viii. 



figs. 14-24. 

 1883. Mysidopsis ajigusta, Czerniavsky, I. c. fasc. iii. p. 25. 



1885. Mysidopsis angusta, Cams, /. c. p. 409. 



1886. Mysidopsis angusta, Normau, Fourth Annual Report Fishery 

 Board of Scotland, p. 158 ; Ann. «& Mag. Nat. Hist. ser. 5, 1887, 

 vol. xix. p. 94. 



Body slender. Rostrum fairly developed, acute, but not 

 reaching- to half the length of the first joint of peduncle of 

 antennules. Antennal scale narrow, linear, of nearly equal 

 breadth tliroughout, 7-8 times as long as broad, twice as long- 

 as peduncle of antennaj and of antennules. Telson in form 

 nearly as that of M. giljbosa^ but narrower at the base in 

 proportion to its length ; apex cleft, the cleft narrow, and in 

 depth equal to the breadth of the telson at the same part ; 

 sides of cleft smootli, and in this respect differing from all 

 other species of Mysidaj which have a cleft in the telson ; 

 lateral spines 14-16, placed at nearly equal distances, the 

 more distal spines somewhat increasing in size, the last 

 situated at the point of the cleft being the largest. Inner 

 uropods longer tlian telson ; acoustic organ not occupying 

 quite half its length ; a single spine only on inner margin 

 opposite otolithic area. Length 8 millim. 



Hah. Banff {T. Edward) ; Moray Firth {T. Scott): Mus. 

 Nor. Loch Fyne and Firth of Forth, to the east of Inch- 

 keith {T. Scott). 



Distribution. Norway {G. 0. Sars) : Mus. Nor. Christiania 

 and Hardanger Fiords, and Aalesund, Norway ; Naples 

 (G. 0. Sars). 



4. Mysidopsis hibernica, sp. n. (PI. IX. figs. 1-5.) 

 Rostrurn short, bluntly rounded at the extremity. Anten- 

 nules having the basal joint subequal in length to the two 

 following. AntenncB with each of the last two joints of 

 peduncle furnished at the inner side of the extremity witli a 

 long spined seta, in addition to ordinary plumose seta3. 

 Antennal scale lanceolate, half as long again as peduncle of 

 antenna;, and about four times as long as broad ; second 

 joint minute, as broad as long, bearing one pair of lateral 



