150 Rev. Canon A. M. Norman on British Mysidge. 



the central is the larger, and two little cilia (or the central 

 portion, as described by Sars, has a "lamina minuta triden- 

 tata, dente mediano longiore"), lateral margins densely 

 spined ; three or four equal spines on the portion anterior to 

 the constriction, after which smaller spines occupy the spaces 

 between larger ones, towards the extremity every fourth or 

 fifth or sixth spine being larger. In7ier uropods rather longer 

 than the telson, margined beneath the seta3 with a dense row 

 of unequal-sized spines, the terminal two or three also being 

 larger than the rest. Outer uropods slightly longer than the 

 inner and nearly twice as broad ; second joint nearly twice as 

 long as broad, outer margin of first joint in adult with about 

 sixteen to twenty-three spines. Length 20 millim. 



Pleopods in male well developed and basal processes of 

 middle pairs completely coiled. 



Hah. Near May Island, Firth of Forth, 1889, and Moray 

 Firth, 1891 (T. Scott) ; Port Erin, Isle of Man [A. Walker) : 

 Mus. Nor. 



Distribution. Hardanger Fiord, Norway {A. M. N.) ; West 

 Norway {G. 0. Sars) ; off Gibraltar, in lat. 38° 15' N., long. 

 5° 49' VV., from Zool. Stat. Naples : Mas. Nor. Christiania 

 Fiord {G. 0. Sars). 



2. Cynthilia Clausii (G. O. Sars). 



187(5. Siriella Clausii, G. 0. Sars, Nye Bidrag til Kunds. oiii Middel- 

 liavets Invertebratfauna, I. Middelliavets Mysider, p. 81, pis. xxix., 

 xxxi. 



1882. Siriella {Siriellidcs) Clausii, Czerniavsky, Monographia Mysi- 

 daruBi impriuiis Imperii Rossici, fasc. i. p. 105, fasc. iii. p. 33. 



188(>. Siriella Clausii, Konuan, Fourth Report Fishery Board of Scot- 

 land, p. 160 ; Ann. & Mag. Nat. Hist. ser. 5, 1887, vol. xix. p. 96. 



Very like S. norvegica, but a smaller species. Antennules 

 with only one plumose seta on inner margin of third joint 

 besides those at the extremity. Antennal scale more than 

 three times as long as wide, narrowly subrhomboidal, nearly 

 reaching extremity of peduncle of antennule. Telson having 

 three subequal small spines and two cilia between the large 

 spines at the angles of the extremity ; not more than two to 

 three smaller spines usually occupy interspaces of larger 

 spines on lateral margins. Outer uropods with the terminal 

 joint shorter, about one third longer than broad ; outer margin 

 of first joint with ten to fourteen spines. Length about 10 

 millim. 



Male with the basal appendage of three middle pairs of 

 pleopods completely coiled. 



liah. Tarbert, Loch Fyne, 1886 [T. Scott) : Mus. Nor. 



