226 GAMMARTD.^. 



A MP II IP ODA . PH OXIDES. 



NATATORIA. 



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 coxa? 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 Phlias, as given by the 



