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



areas," are seen in better preserved specimens to be clean-cut depressions, mainly on 

 the posterior annulus of the anterior of the two segments with which they are in rela- 

 tion. These may occur also on furrow io/ii. 



In some of my specimens there is a tendency for the post-genital depressions to 

 divide into two (as in E. kempi ; see below, Remarks) ; and low flat papillae may be 

 present within some of the depressions. 



Internal Anatomy : — -The dorsal vessel, as in many species of the genus, does not 

 extend forwards to the anterior end of the body; it gives off two pairs of lateral 

 commissures in front of septum 8/9, and is not traceable beyond this, — it does not 

 get on to the gizzard. 



The micronephridia behind the genital region are arranged as a transverse row of 

 small organs in each segment just behind the attachment of the septum ; from the 

 prostatic region forwards they are numerous and irregularly scattered. 



Testis sacs, about which Michaelsen was in some little doubt, are present, large 

 and subspherical, in xi, lying against septum 10/11 ; they are contiguous, and ap- 

 parently communicate with each other, beneath the alimentary canal. 



The spermathecal duct is practically absent, the ampulla being sessile on the 

 body-wall and attached by a portion of its under surface; if a duct is described, it 

 would be very short and stout. The broad fan-shaped diverticulum is often divided 

 into two ; — not always, and when undivided it may appear like a flange surrounding 

 the greater part of the attachment of the ampulla to the body-wall. The number of 

 seminal chambers appears to be about twenty. 



The penial setae vary in length from 2 to 5 mm., and in thickness from 30 to 40/* ; 

 some of the difference in length may be due to the growth of the shorter not having 

 been completed. The extent of distribution of the small teeth on the distal end 

 varies. Even when fully formed setae were projecting from the male pores, the 'dis- 

 tal ends seemed to be often soft and perhaps deformed ; Michaelsen had the same 

 difficulty. The typical form of the tip seems to be broadened and perhaps spoon- 

 shaped. 



Remarks : — I have come to the conclusion that E. kempi, which I described from 

 the Abor country (8), must be identified with the present form. The difference in 

 form and distribution of the genital markings, and in the penial setae, are not suffi- 

 cient to justify its separation, when one takes into consideration the variations that 

 are now known to occur. 



It might be justifiable to separate the specimens from Sureil and Nam Ting 

 Pokri as a distinct variety, on account of (i) absence of pigment, (ii) spermathecal 

 apertures midwaj^ between b and c, (iii) genital markings as pairs of oval depressions, 

 those of a pair being contiguous in the middle line in furrows 19/20, 20/21, and 21/22, 

 (iv) the tip of the penial setae free from ornamentation and smooth, while on the 

 other hand, the minute spines extend further up the shaft than in the typical form. 

 But the forms I previously described as E. kempi show an intermediate condition as 

 regards (ii) and (iii), and in them too the tip of the penial setae is free from spines, 

 though these do not extend far up the shaft. 



