igoS.] W. MiCHAEi^SEN : Oligochœta of the Indian Empire and Ceylon. 155 



Spermathecal pores of first pair on the 8th, segment in the zone of 

 setae. 



Hab« — South India, Kodaikanal in the Palni Hills, 7,000'; Dr. J. R. 

 HENDERSON leg. 



VAR. SII.VKSTRIS, MlCHI^SN. 



Setae: Median ventral and dorsal distances smaller than in the tj^ical form; 

 anteriorly aa = 2ah, at the hinder end aa= ^ he and dd = 2cd. 



Spermathecal pores of the first pair on the 8th segment, but close to the inter- 

 segmental furrow 8-9, nearly united to those of the posterior pair. 



Hab.— South India, Tiger Shola (near Kodaikanal) in the Palni Hills, 

 5,500', virgin forest ; Dr. J. R. HENDERSON leg. 



Pl.UTEI<I.US SIKKIMENSIS, MICHI.SN. 



(Plate xiii, fig. 8.) 

 P. s., MICHAELSEN, in Mt. Mus. Hamburg, xxiv, p. 147, f. 2. 

 Present fourteen partly half mature, partly immature specimens. 



External Characters. — D imensions of the largest half mature specimen: 

 Length 42 mm., thickness | — 1|- mm., number of segments 90. 



Colour white ; without pigmentation. 



Head epilobous (about f). Dorsal appendix of prostomium with parallel lateral 

 borders, open behind, divided by a median longitudinal furrow. 



Setae rather stout, paired, but not strictly, nearly separated, especially the dorsal 

 ones, the ventral ones only in the anteclitellar region. In general the median ventral 

 distance is twice as large as the width of the ventral pairs, somewhat larger than 

 the middle lateral distances, and the latter a little larger than the width of the dorsal 

 pairs {aa=2ah, ab=jbc, bc = ^cd^ or aa : ab : be : cd = S : 4 : 6 : 5). At the anterior 

 part of the body the width of the ventral pairs enlarges so as to be as large as the 

 width of the dorsal pairs, which also enlarges, but less (anteclitellar aa : ab : be : 

 cd = 6 : ^ : 6 : 5) . The median dorsal distance is about four times as large as the 

 width of the dorsal pairs, about equal to the third part of the whole circumference 

 {dd =^cd=^u). 



First dorsal pore at the intersegmental furrow 6-7. 



Clitellum not yet developed. 



Male pores on minute papillae on the eighteenth segment in the lines of setae b. 



Male area: A nearly circular, not sharply bördered median ventral area of 

 darker colour (glandular ?) extends from segment 18, a little upon the 17th and 19th 

 segments and laterally about as far as the lines of setae b. 



Female pores before the setae a of segment 14. 



Spermathecal pores not seen distinctly, probably five pairs at the interseg- 

 mental furrows 4-5 — 8-9 just medial from the Hues of setse b. 



