246 BOPYRIDA. 
ISOPODA. BOPYRIDE. 
NORMALIA. 

PHRYXUS LONGIBRANCHIATUS., 
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 dorsally. 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. 
Tus species is at once distinguishable from Phryzxus 
Mippolyte 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- 
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