AMPHIPODA. 



^ATATOniA. 



BATHYPOREIA KOBERTSONl. 307 



GAMMA RIDES. 



BATIIYPOREIA ROBERTSONI. 



Specific character. Inferior antennai more tlian half tlie length of the 

 animal : flagellum three times as long as the peduncle : articuli numerous, 

 and gradually increasing in length to the extremity of the antennce. Fourth 

 segment of the tail with a wide transverse sinus across the middle. 



Length \ inch. 



BatTii/poreia Rohcrtsoni. 



Si'ENCE Bate, Cat. Amph. Brit. Mus. p. 173, 

 pi. xxxi. fig. 5. 



The eyes in this animal are round. The superior 

 antennae reach beyond the peduncle of the inferior; 

 the flagellum is longer than the peduncle ; and the 

 articuli are regular in size, being nearly as broad as 

 they are long, each supporting a short hair on the 

 superior distal-extremity, and a short auditory cilium 

 of an oval form : the secondary appendage consists 

 of a single articulus, as long as four of the flagellum. 

 The inferior antennae are rather more than half the 

 length of the animal : the last joint of the peduncle is 

 much longer than the preceding ; the flagellum is about 

 three times the length of the peduncle ; the articuli 

 gradually increase in length and decrease in diameter; 

 and every articulus supports upon the upper distal 

 margin a small oval calceola, which, according to Mr. 



X 2 



