entom6straca and phyll6poda. 277 



189 shows a front view of the head of the male en- 

 larged. 



The egg-sack of the female is short and small, the 

 attached end being lengthened, somewhat like the 

 neck of a bottle. The eggs are large, and about 

 twelve in number. 



The body of each sex is about two-thirds of an inch 

 long. Chirocephalus is often found in company with 

 Branchipus, usually in the spring, as early as the 

 middle of March. 



17. BRANCHfPUS (Fig. I go). 



The flesh-colored or pale red body is stout and 

 large, often measuring an inch in length. The head 

 is large, and the frontal appendages of the male are 

 long and broad, as shown enlarged in Fig. 190. 



Fig. igo. — Branchipus (a male). 



These hang down on each side of the head, and are 

 formed of two dissimilar parts. The upper half is 

 broad and thick, and about one-fifth of an inch long. 

 It ends in a stiff, bristle-like prolongation of nearly 

 equal length, with a short, bristle-like tooth at the 

 inner' side at the point of junction of the two parts. 

 There are eleven pairs of swimming feet, and the 

 animal swims on the back. The eyes are two, black, 

 and elevated on the ends of short stalks. 



