igoS.] W. M1CHAEI.SEN : Oligochœta of the Indian Empire and Ceylon. 157 



organs remain in a rudimentary state throughout, but it is difficult to state this with 

 certainty with only half -mature specimens to judge by. 



Hab. — Eastern Himalayas, Sandakphu in the Darjiling district 

 (British Sikkim); C. J. BBRGTHEIIv and I. H. BURKIIyl, leg. 



P1.UTBI.I.US PAI.NIENSIS, MiCHLSN. 



• ' (Plate xiii, fig. 7.) 



P. p., MICHAELSEN, in Mt. Mus. Hamburg, xxiv, 149, f. 3. 

 Present four mature specimens. 



External Characters. — Dimensions of complete specimens: lycngth 170 — 225 

 mm., thickness in shorter, contracted specimens 3 — 4 mm.^ in longer, extended 

 specimens 2—4 mm., number of segments 240 — 260. 



Colour yellowish white or light grey ; apparently without any pigmen- 

 tation. 



Body in general very slender. 



Head epilobous (about f) ; prostomium small, short and broad, its hinder 

 appendix nearly triangular, tapering backwards. Segments of the anterior part of the 

 body, with exception of the first two, divided into 2 — 5 secondary annulets. 



Setae rather small, paired, but not very strictly ; in general the lateral pairs 

 nearly twice as wide as the ventral ones, only for one- third of the middle lateral 

 distances narrower than the latter ; middle lateral distances only a little smaller 

 than the median ventral (in general cd = 2ah =^hc — faa, or aa : ah : he: cd =10 : 3 : 

 9:6). At the anterior part of the body (anteclitellar) the ventral pairs get wider, 

 principally at the cost of the middle lateral distances, getting nearly as wide as the 

 lateral pairs, whilst the middle lateral distances get almost as narrow as the latter ; 

 the median ventral distance is on and just in front of the clitellum only a little larger 

 than the width of the ventral pairs (anteclitellar, a& =|-ci = |6c=f — ^aa or aa : ah : 

 be: cd = 8 — 14 : 7: 9: 8). The medial dorsal distance nearly equals half the circum- 

 ference of the body (^^==ca. ^ u). At the hinder end the dorsalmost setae, those of the 

 Unes d, stand somewhat irregular. 



Dorsal pores seen only behind the clitellum. 



Clitellum indistinctly saddle-shaped, the ventral part less prominent and differ- 

 ing in appearance from the very prominent lateral and dorsal parts, constantly 

 occupying segments 12 — 19 (=8). 



Male pore unpaired, a minute median ventral longitudinal slit at the middle 

 zone of segment 18 on a small papilla, which is surrounded or bordered behind and 

 before by a rather thick wall. 



Female pores in the place of the missing setae a of segment 14, on a common 

 median ventral transversely oval cushion. 



Spermathecal pores two, unpaired, situated medially and ventrally on the 

 intersegmental furrows 7-8 and 8-9. 



