ENTOMOSTRACA AND PHYLLOPODA. 257 



the water in rapid succession, as if a wave of motion 

 were rapidly passing above them. It is a beautiful creat- 

 ure, and one sure to attract attention, not only by its 

 graceful motions and preference for salt water, but by 

 its size, being half an inch or more in length. The eyes 

 are black, and placed on the ends of stalks projecting 

 from each side of the rather small head. The antennae 

 are short, but conspicuous. The eggs are yellowish- 

 white. The young are very active, and differ much in 

 appearance from the parent. They are blood red, with 

 one bluish eye. 



16. CHIROCKPHALUS. 



This curious creature has eleven pairs of swimming 

 feet, as has Branch'ipus, but there need be no difficulty 

 in distinguishing it from Branchipus (for which it may 

 be mistaken) provided the male is obtained. If the fe- 

 male alone is captured some trouble may be experienced 

 by the beginner in determining one from the other. 

 The female of Chirocephalus, however, is slender, while 

 that of Branchipus is stout ; but such a distinction is 

 valueless until both have been seen, or the two sexes 

 have been taken from the same pond. In the latter 

 case the male may be known by the two remarkable ap- 

 pendages hanging down from the sides of the head. 

 These are about one-fourth of an inch long when ex- 

 tended, and are curved and coiled and twisted in a way 

 that defies description. Each one is broad near the up- 

 per or attached ends, and diminishes to a long, curved 

 point covered with minute spines, while in its entire 



