1920.] J. Stephenson: Oligochaeta from India and E. Persia. '215 



Prostomium epilobous f, tongue cut off behind. 



Dorsal pores begin from groove 4/5. 



The setal rings are interrupted dorsally; zz = 2yz behind the genital region, but 

 is rather less elsewhere, — in general about i^yz ; the interval is regular, and the setae 

 z are in longitudinal lines. There is no ventral break. The ventral setae are much 

 closer set than the dorsal. The following numbers were counted : — v/52, ix/56, xii/56, 

 xix/52, and in the middle of the body 54- 



The clitellum extends over half of segment xiii in front and one-third of xvii 

 behind (=3<f). It is smooth, rather lighter in colour, and retains both the setae and 

 intersegmental grooves. 



The male field is a deep squarish depression midventrally on xviii, which takes 

 up the whole length of the segment, and is about one-third of the ventral surface in 

 transverse extent. The anterior wall of the depression is vertical, the posterior slopes 

 more gently ; the sides are steeper than the posterior, but not so steep as the anterior 

 wall. Across the floor and sides of the excavation extends a transverse groove — very 

 narrow, a crack only. The male apertures appear to be situated in this crack, at the 

 junction of the floor and side walls of the depression ; they are thus fairly close to- 

 gether, and about in line with seta d or e. 



The female pore is indicated by a slight depression in a rather pale circular area, 

 between the setal zone and anterior margin of segment xiv. 



The spermathecal pores are two pairs, in grooves 7/8 and 8/9, fairly wide apart, 

 — separated by about a quarter of the circumference, or in line with about the ninth 

 seta from the middle line. 



Internal Anatomy : — No septa are notably thickened ; perhaps 9/10 is most so. 

 The first is 4/5. 



There is a rather large but soft gizzard in segment vi. There are no calcareous 

 glands, but the oesophagus shows the traces of transverse vascular channels in segment 

 xiii, though the tube is not wider here than in neighbouring segments. The intestine 

 begins in xvii. 



The last heart is in segment xiii. 



The nephridial ducts end in the same line. 



Testes and funnels are free in segments x and xi. 



The seminal vesicles in segment xi are quite fused together dorsally, and fill out 

 the whole of the segment. Those which belong to segment xii are similarly fused, — 

 in their hinder parts at any rate ; they pass beyond the limits of segment xii and 

 form a large mass which extends to the hinder end of xiii. 



The prostates are large compact masses, which bulge the septa of segment xviii 

 forwards and backwards, and in this way take up a space of three or four segments. 

 The gland is but little cut up into lobes. The duct emerges from a deep cleft on the 

 inner surface ; it is narrow and bent once or twice while still within this cleft, broad- 

 ens on emerging, and becomes fairly stout and shining in its ectal portion. 



The spermathecae fill out all available space in segments viii and ix. The am- 

 pulla is irregularly ovoid in shape, and the duct is half as long and quite one-third as 



