CYPRIDJE. 
281 
Legion LOPHYIIOPODA.* 
Mouth furnished with organs fitted for mastication. Bran- 
chiae few, attached to the organs of the mouth. Body with 
an envelope, either shaped like a shield, enclosing head and 
thorax, or shaped like a bivalve shell, enclosing the animal. 
Peet not exceeding five pairs ; joints more or less cylindrical 
and fitted for locomotion. Eye one. Two pairs of antennae, 
one pair used in locomotion. 
Order OSTRACODA. + 
Body enclosed in a two-valved covering, like a bivalve 
shell. Hind jaws bearing branchiae. No external ovary. 
Peet, two and three pairs, adapted for progressive motion. 
Pam. CYPRIDAE. 
Two pairs of antennae; upper long, with numerous joints 
and a pencil of long filaments ; lower stout, and like feet. 
Eye single. Peet two pairs. 
Dr. Baird thus describes the shell of these curious ani- 
mals : “ The substance of these valves is compact and very 
* A ocpvpos, with stiff hairs, and irovs, a foot. 
t O (TrpaKoj/, a shell ; from the animal being enclosed in a covering like a 
bivalve shell. 
