246 



BOPYRID^. 



ISOPODA. 



NORM A LI A. 



BOPYRlDJi. 



PHRYXUS LONGIBRANCHIA.TUS. 



Male. Elongate, with the cephalon narrower than the pereion. The eyes 

 very minute. The segments of the pereion nearly equal, laterally separated 

 from each other by a considerable interval. Pleon composed of an elongate 

 ovate-conic piece, in which the segments are fused together. 



Female. Ovate, flattened, slightly unsymmetrical, curved a little to the 

 left when viewed dorsaUy. Pleon with the six segments well defined, 

 narrower than the pereion, furnished with a pair of elongate fleshy lobes 

 on each side of each segment, and with four attached to the terminal 

 segment. 



Length of the male, one line ; of the female, about one-fifth of an inch. 



This species is at once distinguishable from Phryxus 

 Hippolyte and Ph. fusticaudatus by the greater number of 

 fleshy lobes at the sides and extremity of the tail of the 

 female, as well as by their different formation, which latter 

 character separates it from Ph. Paguri. The male has 

 the segments of the body of nearly equal width through- 



