552 



E. BAY LANKESTEB. 



that the limb of the Lowest Crustacea, such as Apus, consists 

 o£ a corm or axis which may he joiuted^ and gives rise to out- 



FiG. 7. 



Fig. 8. 



p^p^p^pi 



Fig. 7. — Diagram of the somite-appeiidape or parapodium of a 

 Polyclipete ClisEtopod. The cliaeta: are onikted. Ax, the axis ; 

 nr. c, neuropodial cirrlius; nr. U, nr. l^, neurojjodial lobes or endites; 

 nt. c, uotojiodial cirrlius ; ni. l\ nt. P, notopodial lobes or exites. 

 The parapodium is represented with its neural or ventral surface 

 uppermost, (Original.) 



Fig. 8. — Three somite-appendages or parapodia of Peri pat us. 

 J, a walking leg ; p to p\ the characteristic "pads;"/, the foot ; 

 cl^, cP, the two claws ; B, an oral ])apilla, one of the second pair of 

 post-oral appendages ; C, one of the first post-oral pair of appendages 

 or mandibles; cl\ cP, tiic greatly enlarged claws. (Compare A.) 



Tlie apjiendages arc represented with the neural or ventral 

 surface uppermost. (Orij,'inal.) 



growths, either leaf-like or filiform, on its inner and outer 

 margins (endites and exites). Such a corm (see figs. 9 and 

 10), with its outgrowths, may be compared to the simple 



