EUSIRUS HELVETIA. 
267 
AMPHIPODA. GAMM ABIDES, 
NATATORIA. 
EUSIRUS HELVETLZE. 
Specific character. Inferior process of the carpi of both pairs of gnatho- 
poda not produced as far as the inferior angle of the palm. 
Length (?) 
Eusirus Helvetica. Spence Bate, Cat. Amph. Crust. Brit. Mus. p. 185, 
pi. xxix, fig. 1. 
The head is short. The superior antennae have the 
first joint of the peduncle longer than the second. The 
flagellum is about twice the length of the peduncle ; the 
articuli being broader than long, each being furnished 
with cilia upon the infero-distal point. The secondary 
appendage (which is very small in the genus) is not 
appreciable in this species. The inferior antennae are 
scarcely shorter than the superior, but the peduncle is 
rather longer than that of the superior. The arms have 
the inferior process of the wrists, not reaching quite to 
the inferior angle of the hands, 'which are somewhat 
lozenge-shaped, the palms being oblique, slightly convex, 
and fringed with a row of solitary cilia. 
We only know this species through an imperfect 
specimen taken by Mr. Edward in the Moray Frith. 
It is the first and only British representative of the genus 
which we have seen. 
The difference in form between the British and Arctic 
species is chiefly conspicuous in the shortness of the 
