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, ho^vever, 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. ^ah), and com- 

 posed of two articulations. Upon the first is placed a 

 small shoot, terminated by four setae, while the second is 

 furnished Avith seven short spines on its upper edge, and 

 terminated by four larger ones. 



Jmine 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 Ci/clops quadricoi'nis ; the palpiform 

 branch springing from the centre, and consisting of three 

 articulations, terminated by several setae. 



The anterior or first pair of foot-jaAvs (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 

 fm'uished with three setae. The posterior or second pair 

 of foot-jaws (f. b d) are of very simple organization. 

 They are formed of three articulations, the last of which 

 appears to be a very fine hook, forming, with the other 

 two, an angle always directed forAA'ards toAvards 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/) 



