244 Eev. Canon A. M. Norman on British Mysidge. 



2. Leptomysis mediterranean G. O. Sars. 



1876. Leptomysis mediterranea, G. O, Sars, Nye Bidrag til Kundskaben 

 om Middelhavets Invertebratfauna, I. Middelhaveta Mysider, p. 27, 

 pis. xix., XX., xxi. 



1882. Lejjtomysis mediterranea, Czerniavsky, I. c. fasc. i. p. 90, ii. p. 21. 



1885. Leptomysis mediterranea, Carus, Prod. Faun. Medit. p. 467. 



General form very slender and narrow and produced; 

 ceplialothorax scarcely wider than the pleon, everywliere 

 adorned with arborescent brown pigment markings, which on 

 the pleon, as seen from above, present to the naked eye two 

 blotches on each segment, and at the base of the telson two 

 dark spots. Rostrum largely developed, elongate-triangular 

 or conical, extending to the end of the first joint of the 

 peduncle of the antennules. Eyes clavate, but not much 

 constricted at the base. Antemial scale of extraordinary 

 length, nearly three times as long as the peduncle of the 

 antennules, narrowly lanceolate, length equal seven to eight 

 times the greatest breadth ; second joint very distinctly 

 articulated, very long, fully one third of total length, with 

 nine to twelve setae on each side and one terminal ; all the 

 setae of the antennal scale are shorter than usual. Telson 

 linguiform, more than twice as long as the greatest breadth 

 of the base, only slightly constricted near the base; extre- 

 mity widely rounded (but not nearly so broad as in L. liny- 

 via-a) ; margin with very numerous spines of unequal 

 length, which towards the extremity arrange themselves in 

 sets of four or five ; middle of extremity with a pair of long 

 spines and two (varying from two to four) much smaller 

 spines between them. Inner uropods longer than the telson ; 

 otolith not very large ; inner margin with numerous (about 

 thirty to forty) spines, which are small, and very crowded 

 near the base, but increase in length distally, the last spine 

 being very long and situated just before the end of the uropod. 

 Length 15-16 millim. 



Hab. Taken by me in great abundance at Guernsey in 

 1865, and remaining with a MS. name in my collection until 

 it was described by Prof. Sars. I have since obtained it at 

 Jersey, and Starcross, Devon. 



Distribution. Adriatic {Glaus). When at the Zoological 

 Station at Naples in 1887 I found this species to be veiy 

 abundant in the Bay : Mus. Nor. Sars has found it at 

 Goletta, Syracuse, and Spezia. Arenys de Mar, Spain 

 (^Antiga, fide de Duer). 



The great development of the second joint of the antennal 

 scale enables this species easily to be separated from all other 

 Mysida;. 



I 



