Fig. 17. — Asfoch.'^ fJiir'mfU'iK.—k, one of the podobrancliite from the 

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

 branchijfi : D, a port of one of the coxopoditic setfe ; 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, hig-hly 

 magnified), h, base of podobranchia ; cs, coxopoditic setse ; cxpy 

 coxopodite t Z, lamina, pi. plume, and sf, stem of podobranchia ; 

 ty tubercle on the coxopodite, to which the setai are attached. 



