276 AQUATIC MICROSCOPY FOR BEG-INNERS. 



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 antennse are short, but con- 

 spicuous. The eggs are yellowish white, and are 

 carried in a conspicuous external egg-sack. The 

 young are very active, and differ much in appearance 

 from the parent. They are blood-red, with one bluish 

 eye. 



16. CHIROCfiPHALUS (Fig. i8g). 



This curious creature has eleven pairs of swimming 

 feet, as has Branchipus, but there need be no difficulty 

 in distinguishing it from Branchipus (for which it may 

 be mistaken) provided the male is obtained. If the 

 female alone is captured some trouble may be experi- 

 enced by the beginner in determining one from the 

 other. The female of Chiroc^phalus, 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 appendages 

 hanging down from the sides 

 of the head. These are 

 about one-fourth of an inch 

 long when extended, and 

 are curved and coiled and 



Fig-. i8q. — Head of male ^ • j. j • . t , j' /- 



chiroc^phaius. twistcd in a way that defies 



description. Each one is 



broad near the upper or attached ends, and diminishes 



to a long, curved point covered vfrith minute spines, 



while in its entire length it is curiously lobed. Fig. 



