liev. Canon A. M. Norman on British Mysidte. 243 



Form slender and elonojate ; ))ellucid and almost coloui-less, 

 except some rosy-coloured blotches at the base of the pleo- 

 pods ; cc])halothorax scarcely wider than the unusually long 

 pleon ; dermis everywhere (even to the cyestalks and anten- 

 iiules) his])id, with minute scales. Bostrum broadly trian- 

 gular, large, acutely pointed at extremity, reaching beyond 

 the middle of the first joint of the antennules ; a notcli on 

 front margin on each side of the base of the rostrum over 

 the insertion of the eyes. Eyes pyriform, very narrow at the 

 base, and much Avidening, projected greatly beyond the sides 

 of the cephalothorax. Antennules with a long and slender 

 peduncle ; first joint hollowed on upper surface, long and 

 slender, the two following much thicker, their combined 

 length equal to that of first. Antennal scale very long, 

 narrowly lanceolate (or subulate), twice as long as the long 

 peduncle of the antennules and about nine times as long as 

 the greatest breadth at the base ; second joint occupying 

 nearly one third of total length, extremely narrow, furnished 

 with five sette on each side and one terminal. Legs very 

 slender, the 3-articulated tarsus not longer than the preceding 

 joint; nail very long and slender. Telson elongated, 

 narrowly linguiform, shorter than inner uropods^ constricted 

 near the base, beyond which the sides are gently arched ; 

 margins throughout furnished with crowded spines, which 

 towaids the extremity are ranged in series of three or four of 

 gradually increasing length ; apex narrowly rounded, bearing 

 four spines, the inner pair of which are about two thirds the 

 length of the outer. Uroiwds very narrow, the outer very 

 long, one third longer than the inner ; inner swollen at the 

 base, where the otolith is large, bearing a large spine at the 

 extremity itself, and a range of spines of unequal size and 

 irregular arrangement all along the inner margin. Length 

 13 millim. 



Hob. A single male was dredged by me in 40-50 fath. 

 five to seven miles off Balta, Shetland, in 1867. Shortly 

 afterwards both sexes were sent to me by T. Edward from 

 Banff. Moray Firth and Firth of Forth {T. Scott): Mus. 

 Nor. 



Distribution. Sars has taken this species in the Christiania 

 Fiord, at Stavanger, and at Mosterhavn in the Hardanger 

 Fiord, in 10-40 fath. {Mus. Nov.), Boulonnais. France 

 {Giard). 



The hispidity of the dermis of L. gracilis distinguishes it 

 at a glance from its allies. 



