1920.] J. Stephenson: Oh'c/ochaeta from India and E. Persia. 231 



The spermathecae were, as seen in dissection, of the simplest possible form, — 

 elongated sacs, narrowing somewhat at their ectal end, without diverticulum. On 

 microscopical examination however a diverticulum was seen, bound down to the main 

 sac ; this was an ovoid simple appendage, showing no seminal chambers, entering the 

 main sac rather nearer the ectal than the ental end ; it was a little narrower towards 

 its attachment, but there was no stalk ; its length was a quarter, its thickness less 

 than half, that of the main pouch. 



The penial and copulatory setae were exactly those of the variety next to be 



described. 



var. riparius, var. nov. 



Plate X, figs. 34, 35. 



Gwalior, Central India ; on the bank of a stream. 17-vi-1917. B. Prashad. Four specimens. 

 Same place ; in a garden. Same date and collector. Numerous specimens. 

 Same place ; under flower-pots. Same date and collector. Two specimens. 



External Characters : — The largest specimen examined was 90 mm. long, and 3*5 

 in diameter. Colour buff or yellowish grey, no difference between dorsal and ventral 

 surfaces ; the clitellum may have a reddish tinge. Segments 135. 



Prostomium tanylobous or almost so ; furrows at the sides of the tongue parallel, 

 but may be only slightly marked. 



Dorsal pores begin at the hinder border of the clitellum. 



The setae are paired. The relations may be expressed thus : — In front of the 

 clitellum ab = \aa = \be = \cd ; behind the clitellum = f aa = f be = %cd ; in the mid- 

 dle of the body = \aa = \bc =cd; dd in the middle of the body is equal to f of the 

 circumference. 



The clitellum extends over segments xiii-xvii ; it is thickened, well defined at 

 both ends, the furrows obliterated but setae just indicated. 



The male area is rather square, with thickened borders ; it includes segments 

 xvii-xix and the anterior half of xx, extending transversely across the whole ventral 

 surface. This area presents a dumbbell-shaped depression, expanded on segments 

 xvii and xix, the narrowed handle of the dumbbell being on xviii (i.e. the dumbbell 

 is placed longitudinally) ; the narrowing of the depression on xviii is caused by two 

 large flat papillae, continuous at their outer margins with the thickened edge of the 

 general male area (fig. 34). 



The prostatic pores are in the line of setae b, in the broadened ends of the dumb- 

 bell ; the seminal grooves are convex inwards, skirting the inner border of the flat 

 papillae. 



The whole male field may be compared with that of the typical form by suppos- 

 ing that the lateral papillae of the present form have there extended mesially and 

 joined, thus producing two separate depressions, one on xvii and one on xix (what I 

 have called the " trenches "), with an intervening transverse ridge on xviii. 



The female pores (or pore) are doubtless situated in a transversely oval area in 

 front of the setal zone of segment xiv, which extends from a point between a and b 

 on one side to a corresponding point on the other. 



