O.CopuUrory Organs lO.Swimming FooT 



ll.Uropod 



Fig. 84. — The principal appendages of the Fresh-water Crayfish, placed in the 

 same position, with the protopodite {pr) and epipodite {ep) dQwn\\'ards, the 

 endopodite {eii) to the left, and the exopodite {ex) to the right. 

 The protopodite is typically formed of two podomeres {pr. i,/?'. 2), the endopodite 



of five {en. \ — en. 5) ; a gill {g) may be attached to the epipodite. 

 The three proximal segments of the antennule are marked i — 3, its flagella/?. t 

 and_;^. 2 ; the distal end of the endopodite of the antenna is a Hagellum {Ji). 

 (The tufts of threads in 7 and 8 are very long set^ which extend between the 

 gills). _^ (From Parker and Haswell's Zoology^ after Huxley.) 



■-^ The Structure of these appendages is best understood by 

 a consideration of the third niaxilliped (Fig 84, 7). The 



