B "^-///y 



Fig. ]7. — Jxtf/cn.i ff/n-iat>H.<i. — A, one of the podobranchia3 from the 

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

 branchiic ; D, a part of one of the coxopoditic setaj ; 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 8 ; D — G, highly 

 magnified). I>. base of podobranchia ; c.<?, coxojioditic seta3 ; c.rj?, 

 coxopodite • I, lamina, pi. plume, and .ff, stem of podobranchia ; 

 f, tubercle on the coxopodite, to which the s( ta3 are attached. 



