BATHAPOREIA ROBERTSONI. 
307 
A MPHIP ODA . OA MM A RIDES . 
NATAT0R1A. 
Specific character. Inferior antennae more than half the length of the 
animal : flagellum three times as long as the peduncle : articuli numerous, 
and gradually increasing in length to the extremity of the antennae. Fourth 
segment of the tail with a wide transverse sinus across the middle. 
Length \ inch. 
Bathyporeia Robertsoni _ Spence 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 
