PLATE XXXVIII 



b, ganglion; be, body cavity; c, gonad; cc, collar cavity; cp, collar-pore; 

 d, notochord; dh, diverticulum of pharynx; e, post-oral lamella ; ej-, gill- 

 slit ; h, pharynx ; j, heart and pericardium ; In, post-oral nerve ; In^ , nerve 

 to pharynx; In^, nerve to post-oral lamella; In^, nerve to body wall; na, 

 nerve to arms; pc, pericardial cavity;/)/, pleurochord;/)«, pre-oral nerve 

 plexus ; prii , nerve plexus in the ventral wall of proboscis ; pp, proboscis 

 pore canal; r, rectum. 



Figs. I to 8. Series of transverse sections of C. denstis showing the 

 nervous system. 



