THE CLASSIFICATION OF CRUSTACEA 35 



"Fairy Shrimp" has been given (Fig. 10). It is 

 known in technical zoology as Chirocephalus di- 

 aphanus, and is a representative of the subclass 

 BRANCHIOPODA. The members of this group are 

 distinguished from other Crustacea by their flattened, 

 leaf-like feet, each of which is divided into a number 

 of lobes, and has a gill plate on the outer side. In 

 Chirocephalus there is no carapace, and the head is 

 followed by eleven distinct body segments, each 

 bearing a pair of leaf-like, or rather fin-like, feet. 



FIG. 10 THE "FAIRY SHRIMP" (Chirocephalus diaphanus), 

 MALE, x 2. (After Baird.) 



The hinder part of the body has no appendages, 

 and ends in a forked tail. In the female a large 

 pouch hangs from the under-side of the body, just 

 behind the limb-bearing part, and is often found 

 filled with eggs. In the male, a pair of remarkable- 

 looking appendages, each shaped somewhat like a 

 hand with webbed fingers, hang in front of the head. 

 These are connected with the antennae, and are 

 known as the "claspers," from their function in 

 seizing and holding the female. The eyes are set on 

 movable stalks. Those Branchiopoda which, like 



