EUSIRUS HELVETLE. 267 



A MP HIP ODA . GA MM A RIDES. 



NATATORIA. 



EUSTRUS HELVETIiE. 



Specific cliaracter. Inferior process of the cariii of Loth pairs of gnatho- 

 poda not produced as far as the inferior angle of the palm. 

 Length ( ? ) 



Easirus Ilchetice. Spence Bate, Cat. Amph. Crust. Brit. Mns. p. 185, 

 pi. xxix. fig. 1. 



The head is sliort. The superior antenna? 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 uj)on the infero-distal point. The secondary 

 appendage (which is very small in the genus) is not 

 appreciable in this species. The inferior antenna 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 



