1914-] J- Stephenson : Oligochacla from Northern Ir.dia. 341 



The clitellum extends from ^xiv to xvii=3f . The separate 

 segments can still be distinguished, and setae and dorsal pores are 

 present. 



The setae form a ring, which is almost closed dorsally {zz=i\ yz 

 approximately), but the interval is irregular. Ventrally the 

 interval is much larger, — aa=2\--^ah, or in front of the clitellum 

 may be as much as 4^6. Of the intersetal intervals ab is the 

 largest ; but there is no regular decrease on passing outwards. 

 The largest setae in each ring are aa ; the dorsal setae are often 

 difficult to make out, partly because the}^ are smaller, and 

 partly because of the pigmentation. The following numbers were 

 counted • — v/28, ix/40, xii/44, xix/34, and more posteriorly 32-34. 



The male apertures (fig. 2) are on segment xviii, between the 

 lines of setae b and c, with projecting penial setae. Bach pore is 

 situated within, and nearer the outer border of, a slightly raised 

 flat glandular area, which takes up the whole of the length of the 

 segment, and may both encroach on segment xix and cause a 

 forward bending of furrow H. The inner border of each of these 

 areas is semicircular, the outer is indented so as to form three 

 lobes, giving a constant and characteristic appearance (fig. 2). 

 The apertures themselves are nearly a fourth ot: the circumference 

 apart. 



The female pore is perhaps indicated by a minute depression 

 in the mid- ventral line on the anterior part of segment xiv, just 

 in front of the annulation which marks the anterior extent of the 

 clitellum. 



The spermathecal apertures are small, in furrows 'f, I, and t}, 

 in about the lateral line of the body. There are no other genital 

 markings. 



The first septum is i}, which is not, or only slightly, thickened 

 f, I and I are considerably, to, M and T2 greatly thickened 

 after this the thickness rapidly diminishes, If being moderately 

 and tI slightly thickened. 



The gizzard is in front of septum ,1 ; between the hinder end 

 of the pharynx and septum I the alimentary tube forms an ovoid 

 dilatation, of which the posterior half or rather more has the 

 thick muscular wall which constitutes it a gizzard, while the 

 anterior portion is quite soft ; the gizzard therefore has the shape 

 of a half ellipsoid, and may^ be compared to an egg-cup. The 

 oesophagus is slightly dilated in each segment from vii to xii, but 

 no calcareous glands are marked off from the tube, though the 

 wall has a lamellated structure (in segment ix, where the tube 

 was cut into). The intestine begins behind the prostates, in 

 segment xx. 



The last heart is in xiii. 



From segment xxi onwards there are a meganephridium and 

 a row of very small micronephridia on each side in each segment ; 

 the arrangement is the same at the posterior end of the animal, 

 where the meganephridium occupies a lateral position in the 

 segment. In front of xxi onl}^ micronephridia are present ; while 



