210 Memoirs of the Indian Museum. [Vol. VII, 



Remarks : — Here again, in the pale colour and the testis sacs, there is a resem- 

 blance to P. himalayanus. But here too the differences seem to be too great to allow 

 us to unite the two forms in a single species. Apart from less important features such 

 as the numbers of the setae and the extent of the dorsal pores, we have to consider 

 the extent of the clitellum, the much greater development of the gizzard in the pre- 

 sent form, and especially the quite different configuration of the male field and the 

 much greater approximation of the pores. 



var. affinis, var. nov. 

 Plate IX, figs. 12, 13. 



Sitong Ridge, alt. ca. 4,700 ft., Darjiling Dist., E. Himalayas. 22- 28-X-1917. N. Annandale 



and F. Gravely. Two specimens, one not fully mature. 



Jor Pokhri, 4,800 ft., Sitong, Darjiling Dist., E. Himalayas. 22-28-X-1917. N. Aunandale and 



F. Gravely. A single specimen. 



External Characters : — Length 55 mm. ; diameter 2*25 mm. A slight slaty or 

 purplish tinge dorsally, with well-marked median darker stripe ; pale ventrally. 

 Segments 105. 



Prostomium epilobous §, the tongue not cut off behind. 



Dorsal pores begin from 4/5. 



The setal rings are almost unbroken both dorsally and ventrally ; the ventral 

 break is absent or practically so throughout, and there is no dorsal break in the 

 hinder part of the body ; anteriorly a small break exists on the dorsal side, where zz 

 = \\yz. The setae are closer set ventrally than dorsally. The following numbers 

 were counted : — v/38, ix/44, xii/45, xix/37, and in the middle of the body 36. 



The clitellum extends over four segments, xiii to xvi ; it is narrowed, but not 

 much modified otherwise. 



The male field (fig. 12), on segment xviii, consists of a depression with sloping 

 sides ; on these sides are placed the papillae with the male pores, so that these face 

 somewhat inwards. The papillae are rather wider transversely, are delimited by 

 grooves in front and behind, the grooves in front being the better marked ; and are 

 separated in the middle line by a slight interval, while laterally they fade away into 

 the general surface without any definite delimitation. The apertures are small trans- 

 verse slits, their centres in line with seta c. 



The female aperture is marked by a median roundish pit anteriorly on segment 

 xiv, abutting on groove 13/14. 



The spermathecal pores are in grooves 6/7 and 7/8, opposite the interval cd. 



Internal Anatomy : — A number of septa in the anterior part of the body are 

 slightly thickened, but none more than slightly. 



The gizzard is in segment v, and is of moderate size and fairly firm. The intes- 

 tine begins perhaps in xviii, but is narrow in xviii and xix, where it is compressed by 

 the prostates. 



The last heart is in xii. 



The ducts of the nephridia appear to end at different levels on the body- wall ; 



