14 TH. MONTGOMERY, Descriptions of new Metanemerteans. 



the nerve chords (N.Comm), and tlie most posterior rliynchocoelic 

 diverticulum (R.D). R rhyncliocoel ; R.S sheath of the latter ; Int m- 

 testine, Int.D metameric diverticulum of the intestine ("Darmtasche"); 

 Ep.M epithelial muscular wall; Ov ovum. Beneath the rhynchocoelic 

 sheath {R.S) is seen the dorsal blood vessel, the lateral vessels being 

 placed at the latero-ventral corners of the body. Camera lucida, Zeiss, 

 oc. 2, obj. A. 



Fig. 28. Zygonemertes virescens. Outline of the body, within 

 which, in the rhynchocoel (R), lies the proboscis : A.P papillary por- 

 tion, Si.R stilet region, P.P posterior region, R.M retractor muscle of 

 the proboscis. R.S sheath of the rhynchocoel. Ä anterior end (head), 

 P posterior end of the body, X about 10, from a section.' 



