Rev. Canon A. M. Norman oti British Mysidge. 161 



specimens for determination which he had procured in the 

 Firth of Forth : Mus. Nor. 



Distribution. West Norway {G. 0. Sars) ; Klosterelv 

 Fiord, East Finmark {A. M. N.) : Mus. Nor. Goes gives as 

 localities of this species Finmark (Loven), Christiansund 

 {LiVjehorg) ; Widebay, Spitzbergen, 40 fath., mud. Professor 

 G. O. Sars records it from many localities in South as well as 

 West Norway, and from the Lofoten Islands, in depths of 

 viO-lOO fath. White and Murman Seas {Jarzynsky). 



2. Erythrops elegans (G. O. Sars). (PI. X. fig. 10.) 



18G3. Kematoptts elegans, G. O. Sars, Beret, oni en i Somm. 1862 foret- 

 agen Zool. Reise i Christianias og Trondhjems Stifter, p. 42. 



186(3. Nematopus pygmceus, G. O. Sars, Beret, oui en i Somm. 1865 

 foretagen Zool. Reise af Christianias og Christiansauds Stifter, p. 17. 



1870. Urgthrops pygmcea, G. O. Sars, Carcinol. Bidrag til iSorges 

 Fauna, 1. Monogr. Mysider, p. 33, pi. ii. tigs. 20-28. 



1883. Erythrops pygmcea, Czerniavsky, /. c. fasc. iii. p. 16. 



1885. Erythrops pygnieea, Carus, /. c. p. 469. 



1886. Erythrops pygmcea, Norman, Fourth Annual Report Fishery 

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

 vol. xix. p. 93. 



The smallest of all described Mysidea ; pleon slightly 

 narrower than the cephalothorax. Rostrum short, narrow, 

 and obtusely pointed. Eyes rather longer than broad, tri- 

 angular or pyriform, widening greatly distally, flattened ; 

 cornea occupying centrally about one third of total length. 

 Antennal scale ahiiost exactly as in E. Goesii, Gnathopods 

 small and weak, antepenultimate joints longer than the two 

 following, terminal joint as long as the joint from which it 

 springs. Legs shorter than those of E. Goesii', last pair when 

 bent backwards reaching a little beyond fourth segmentof pleon, 

 preceding joint subequal in length to the three articulations of 

 the tarsus ; first of these articulations in the anterior legs 

 shorter than in the hinder, equal to the combined length of the 

 two distal. Telson nearly as in E. Goesii^ but the sides 

 slightly arcuated (instead of straight), the extremity trun- 

 cated in a straight line, and the four terminal spines of sub- 

 equal length, though the outer are rather the shorter. Inner 

 uropods with the inner margin plain {i. e. not serrulated). 

 Length 9 millim. 



Ilab. This species was added to the British fauna bj 

 Mr. Thomas Scott, who sent the specimen for determina- 

 tion in 1885, which he had taken at Tarbert, in Loch Fyne, 

 in shallow water ; and in 1889 he procured it in the Moray 

 Firth : Mus. Nor. 



