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GAMMA RIM. 
AMPHIPODA. 
NATATORIA. 
PITOXIDES. 
Genus— PEREIONOTUS. N. G. 
Generic character. Cephalon short. Pereion distended. 
Pleon compressed. Antennae very short. Superior longer and 
more robust. Gnathopoda subchelate, subequal. Pereiopoda 
short, robust. Antepenultimate pair of pleopoda having the 
peduncle very short, rami long, subfoliaceous. Penultimate 
pair having the peduncle long, rami styliform. Ultimate pair 
short, unibranched. Telson single. 
The head in this genus is very short. The body is 
very distended, and the tail gradually narrowed to the 
extremity. The eyes are very small. The coxae of the 
first four pairs of legs are large, whilst those of the 
three last are short. The hands of the first two pairs 
are subchelate. The walking legs are subequal, short, 
tolerably robust, and terminate in strong sharp fingers. 
The antepenultimate pair of caudal appendages have the 
peduncle very short, almost obsolete ; and the branches 
are long, and look like narrow leaves. The penultimate 
pair have the peduncle strong, and as long as the 
branches, which are strong, stiff, and naked. The 
ultimate pair are very short, and support a single very 
short branch. The central terminal piece consists of a 
single squamiform plate. 
This genus bears a near relationship to that of Phlias 
of Guerin. The only distinction of importance which 
we are enabled to discover exists in the form of the 
posterior pair of caudal appendages : these are biramous 
in the description and figure of PhliaSj as given by the 
