46 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 1 37 



In the dorsal wall of the preoral cavity there is located an enlarged 

 lobe called by Snodgrass the "labral lobe" but by Manton and others 

 the "tongue" (figs, i A, 2 A, Dl). Though this structure appears to 

 be independent of the ring of lobes around the edge of the opening, I 

 believe that it is simply one of the circumoral lobes greatly enlarged 



Pcav ^--^'t 



<^MS?S^^f^^SS- Fcl 



iprm-> 



,t php 



Fein 



Nc— ::-c^V -^ 



Fig. I. — Onychophora. Internal structure of the head of Peripatoidcs 

 novae-aealandiae. 



A, head from ventral side. B, dorsal dissection of head showing brain and 

 associated structures. C, same with brain removed. D, same with brain and 

 oesophagus removed. 



Ant, antenna; Apd, apodeme of feeding claws; Fcl, feeding claws; Fein, 

 feeding claw nerve; Dl, dorsal lobe; Br, brain; Nc, ventral nerve cord; Pcav, 

 preoral cavity; Sip, slime or oral papillae; Slg, slime gland; aprm, anterior 

 protractor muscles of the feeding claws; drm, dorsal retractors of the feeding 

 claws ; dv, dorsoventral muscles ; exdl, anterior extensor muscles of the dorsal 

 lobe; idl, lateral dilators of dorsal lobe; php, protractor muscles of pharynx; 

 rdl, retractor muscle of dorsal lobe; vrni, ventral retractors of feeding claws. 



