Rev. Canon A. M. Norman on British Mysidee. 159 



Rostrum short, obtusely rounded. Eyes small ; peduncles 

 short and thick. Antennal scale small, scarcely as long as 

 peduncle of antenna, narrowly elliptic, about three and a half 

 times as long as broad, setose all round. First legs strongly 

 built, only seven-jointed ; ischium and meros subequal in 

 length, both strongly formed, the latter with 4 (6-8*, S. I. S.) 

 spines and numerous setjB on front margin; penultimate arti- 

 culation minute, subquadrate ; finger largely developed. 

 Remaining legs of usual Mysidean type ; tarsus of 5-6 articu- 

 lations ; nail setiform. Telson short, length to breadth as 

 about 5 to 3, cleft at the extremity ; distal portion of lateral 

 margins with 14-17 spines (11-16, S. I. S.) ; cleft with 16-22 

 serrations. Inner uropod having beneath the seta3 on inner 

 margin about 17-19 spines (17-18, S. 1. 8.). Length 8 

 millini. 



I have united Smith's and Sars's species because, 1st, the 

 number of spines on the carpus would appear not to be con- 

 stant ; 2ndly, because the serrations of the cleft sometimes 

 reach the extremity, in other instances not. One of my speci- 

 mens shows on one side the one condition, on the other the 

 other. 



Hah. Guernsey, 1865 [A. M. N.) ; Firth of Forth, 1888 

 ( T. Scott) : Mus. Nor. 



Distrihution. Coast of United States {S. I. Smith) : Mus. 

 Nor. Near Bergen, 6-10 fath. {G. 0. Sars). 



Prof. Smith says of this species : " The species was never 

 found in abundance except hidden away inside dead bivalve 

 shells, usually Mactras, dredged in 5-10 fath. As many as 

 twenty were sometimes found in a single shell. The males 

 and young were occasionally taken at the surface in the 

 evening in Vineyard Sound." With this hint as regards the 

 habits of the animal it may not hereafter prove so rare on 

 the European coasts as it has hitherto seemed to be. 



Subfam. IV. Leptomtsinju. 

 Genus 5. Erythrops, G. O. Sars. 



= Nematopus, G. 0. Sars. 



Eyes short, broad, flattened, brilliant red. Antennal scale 

 short, linear ; external margin not ciliated, terminating in a 

 spine-point ; in other cases the margin serrated. Legs very 

 long and slender, filiform, tarsus of three articulations ; nail 



* In a specimen received from Prof. S. I. Smith I can only .see four 

 spines. 



