APPENDAGES OF CLADOCERA 



41 



In the Sididae there are six pairs of thoracic linabs, which are 

 nearly alike in the female ; in the Bosminidae there are six pairs, 

 the first two modified for prehension, the last much reduced. 



^i'-- 



Mf. 



■^.!, 



.Gn. 



G-Tb. 



JBt. 



Fig. 12; — Thoracic limts of female Simocephalus vetulus. A, The first ; B, the second ; 

 C, the third ; D, the fifth. Br, Bract ; Ep, epipodite ; Ex, exopodite ; On, 

 gnathohase. 



In the male, the first thoracic limb is usually provided with 

 a long sensory process and a prehensible hook (Figs. 11, 19). 

 In the Gymnomera the limbs are cylindrical, jointed rods. 



