PHRYXUS. 257 



Gen. 135. PHRYXUS, Rathke* 



Antennae four, short, slender. Eyes (of the male) small. 

 Back of the female flat, of the male convex ; abdomen of 

 the female convex, of the male flat ; legs of the female in- 

 clined towards the back, those of the male formed for walk- 

 ing. Branchiae of the female large, two-lobed ; those of the 

 male rudimentary. 



Phryxus Hippolytes, Rathke. — Female with scarcely 

 any legs on one side of the body ; the lobes of the branchiae 

 larger and somewhat oblong j the tail of the male produced 

 into a short blunt point. 



Pound on a species of Hippolyte, and also on the White 

 Shrimp on the coast of Sussex (Bond. Proc. Ent. Soc. April, 

 1846). Another species of Thryxus is found on the Pagums 

 Bernhardus on the Norwegian coast \ it is described and 

 figured by Rathke. This species is most probably also a 

 native of our seas. 



* Nov. Act. Acad. Nat. Cur. xx. p. 40. 



