APPENDAGES OF CLADOCERA 



41 



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

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

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



Ep. 



Git. 



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

 C, the third ; D, the fifth. Br, Bract ; £p, epipodite ; JSx, exopodite ; Gn, 

 guathobase. 



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, 



