206 
BRITISH ENTOMOSTRACA. 
The antennae are very short, compared with those of 
the two preceding genera. In the female (f. 5 a) they 
are composed of nine articulations ; in the male (f. 4 a) 
of only seven. Between the fourth and fifth articulations 
in both sexes, we see a small lateral ring of one short 
joint, and two or three setae. 
In the male, both antennae have the swelling and hinge- 
joint, the swelling existing chiefly about the fifth articu- 
lation ; all the first five, however, being of greater size 
than the corresponding ones in the female. The hinge- 
joint is situated near the extremity. 
The antennules are simple (t. XXV, f. 5 3), and com- 
posed of two articulations. Upon the first is placed a 
small shoot, terminated by four setae, while the second is 
furnished with seven short spines on its upper edge, and 
terminated by four larger ones. 
Jurine represents the antennules as of six articulations, 
and his figure of these organs differs entirely from mine, 
which after frequent and repeated examinations never 
varied in their appearance in the least. 
The mandibles (f. 5 c) in figure resemble very much 
those organs in the Cyclops quadricornis ; the palpiform 
branch springing from the centre, and consisting of three 
articulations, terminated by several setae. 
The anterior or first pair of foot-jaws (f. 5 e ) are com- 
posed each of a pretty large, oval body, dividing at the 
extremity into four short digitations, of equal length, each 
furnished with three setae. The posterior or second pair 
of foot-jaws (f. 5 d) are of very simple organization. 
They are formed of three articulations, the last of whieh 
appears to be a very fine hook, forming, with the other 
two, an angle always directed forwards towards the mouth. 
These hooks appear to stop all molecules of food in their 
passage, and, by their constant motion, carry them to the 
mandibles. 
The feet are five pairs in number, and are much longer 
in proportion than in the preceding genus, and differ in 
some respects from each other. The first pair (f. 5/) 
