igoS.] W. MiCHAEivSEN : Oligochceta of the Indian Empire and Ceylon. 169 



Spermathecse (fig. 11): Ampiilla globular, hardly as long as broad, opening 

 by means of a duct, which is as long as the ampulla and hardly thinner. The lumen 

 of the duct is somewhat widened and distinctly set off from that of the ampulla. 

 There are no diverticula. 



Hab,— Eastern Himalayas, Phallut in the Darjiling district (British 

 Sikkim), 11,800-12,000'; C. J. BERGTHEIIv and I. H. BURKII.I, 



leg. 



PERIONYCHEI.I.A NAINIANA, MICHI.SN. 

 P. n., MICHAELSEN, in Mt. Mus. Hamburg, xxiv, p. 155. 



Present four more or less mature specimens and some young ones. 



External Characters,— Dimensions of a fully mature specimen: I^ength 85 

 mm., thickness 2|— 3^ mm., number of segments ca. 105. 



Colour dorsally dark bluish violet, with greenish iridescence, ventrally in 

 general grey, at the anterior part of the body the pigmentation, becoming violet-grey, 

 passes all round the body. 



Head epilobous (about ^). Hinder appendix of prostomium nearly square, 

 open behind. 



Setae moderately and equally large everywhere, nearly equidistant from one 

 another. Circles of setse complete. Numbers of setae differing very little relatively 

 on different segments, about fifty on the segments close behind the male pores. 



Dorsal pores distinct from the intersegmental furrow 3-4. There appears to 

 be a narrower or perhaps rudimentary dorsal pore already at the intersegmental 

 furrow 2-3. 



Clitellum, in external appearance only differing by its colour, occupying seg- 

 ments 13—18 ( =6). 



Male pores at the i8th segment a very short distance behind the circle of setae, 

 which is interrupted before them ; they are small transverse slits, distant one from 

 the other about \ of the circumference of the body. The circle of setae of the 18th 

 segment is broadly interrupted in the median part. There remain only five or six setae 

 in this circle medial from the lines of the male pores, and these medial setae, without 

 being pushed out of the regular row, are modified (see below). 



Spermathecal pores two pairs at the intersegmental furrows 7-8 and 8-9, 

 those of each pair distant one from the other about |- of the circumference of the body. 



There are no distinct copulatoryorgans, but the whole ventral surface of the 

 i8th segment appears glandular and whitish in colour. 



Internal Anatomy, — The septa of the anterior male region are a little thick- 

 ened, but not much. The thickening of the septa gradually decreases ; the septa 

 5-6 and 14-15 are tender. 



Alimentary tract: A very small, but not exactly rudimentary, gizzard in the 

 5th segment. This gizzard is only a little thicker than the neighbouring parts of the 

 œsophagus, but its muscle-layer is relatively thick, being about eight times as thick 

 as the inner epithehum or the muscle-layer of the neighbouring parts of the œsophagus. 



