st-- 



l.—\ 



B 



Fig. 17. — Astacns flui'iatiUs.—X, one of the podobrancliiEe from the 

 outer side ; B, the same from the inner side ; C, one of the arthro- 

 branchitfi ; D, a part of one of the coxopoditic setse ; E, extremity of 

 the same seta ; F, extremity of a seta from the base of the podo- 

 branchia ; G, hooked seta of the lamina ; (A — C, x 3 ; D — G, highly 

 magnified), h, base of podobranchia ; cs, coxopoditic setae ; cxp, 

 coxopodite : I, lamina, pi, plume, and st, stem of podobranchia ; 

 t, tubercle on the coxopodite, to which the setas are attached. 



