CYPRID.E. 281 



Legion LOPHYROPODA.* 

 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. 

 Feet 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 OSmACODA.f 

 Body enclosed in a two-\alved covering, like a bivalve 

 shell. Hind jaws bearing branchiae. No external ovary. 

 Feet, two and three pairs, adapted for progressive motion. 



Pam. CYPRIDJE. 



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 



* Aocpvpos, with stiff hairs, and irovs, a foot. 



f OcrrpaKov, a shell ; from the animal being enclosed in a covering like a 

 bivalve shell. 



