SHELLED CRUSTACEANS. 





the body and feet; L-6 are the six lobes of the legs, to the 

 outer Bide of which arc attached the gill ami the broad ac- 



The simplest Brunchiopods are bivalved, and are usually 



v 



Fig. 107.— Limnetia brevifrons Much enl irge 1 



than a tenth «»f an inch in length. They arc called 



"■mhi. 



Rather larger forms are the water-fleas i Daphnia), which 



represent the sub-order Cladocera. 



The mosl interesting sub-order is the 



Phyllopoda. In them (Fig. 107, Lim- 



mils) ami Estheria i Fig. \0i>) the body 



and legs are entirely concealed by the 



large bivalve shell. In Apus ( Fig. 109) 



frla and Lepidurus (Fig. 110) the shield 



ii.:ir, ,,;,-,• a shelled i s broad and flat, concealiug hut a 



Phyllopod. 



pari of the body. In Branchipu& l 1" _-. 

 Ill), which is common in roadside pools and in ponds in 

 the cooler parts of the year, there is no carapace. The 

 Phyllopods swim on their hacks. Apus is remarkable I 

 having 47 segments in all. and 60 pairs of lim - 

 segments hearing as many as six pairs of limbs. All the 



