1914-] J.Stephenson: Oligochaeta irom Northern India. 325 



More particularly, the anterior setae (fig. la) may reach a 

 maximum length of 90M ; their breadth is approximately 2'2m. 

 The distal prong of the free forked end is considerably longer 

 than the proximal, and the two prongs are of equal thickness at 

 their base ; the angle between the prongs is narrow. The shaft is 

 comparatively straight ; the nodulus is very markedly proximal to 

 the middle of the length of the shaft, the proportions of the 

 sections of the shaft proximal and distal to the nodulus respec- 

 tively being i : 2 or 3 : 5. 



The posterior ventral setae (text- fig. lb) reach a length of 48/i, 

 and are in breadth about 2*5^ The proximal prong of the forked 

 end is slightly longer, and is twice as thick at the base as the 

 distal ; the angle between the prongs is moderately wide. The 



FiG. I. — Nais raviensis; setae; rt, anterior ventral, Z), posterior ventral ; c, dorsal 

 needle, a X 830, b x 1150, c X 1350. 



curves of the shaft are more marked than in the anterior setae : 

 and the nodulus is distal, the ratio being :— proximal to nodulus; 

 distal to nodulus : : 5 : 3. 



No coelomic corpuscles were seen. 



On the dorsal side of the pharynx, and back as far as seg- 

 ment V, are a number of large, oval or pyriform, perhaps glan- 

 dular cells, with well-marked nucleus, not very unlike the cells of 

 the septal glands in the genus Pristina. Chloragogen cells begin in 

 segment vi. No stomach was noted in the living animal ; the 

 oesophagus was narrow as far as segment viii, where it widened to 

 form the intestine; in a stained specimen, however, there appears 

 to be a stomachal dilatation in viii, followed by a narrower 

 portion for a short distance, but this part of the tube quickly 



