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



one on the posterior part of xvi, the other taking up most of the length of xx ; these 

 extend from about, or within, the line a to the lateral margin of the body ; they are 

 transversely oval in shape, and slightly depressed in the middle ; the anterior pair 

 may be narrower from front to back than the posterior. In a number of cases there 

 are also median papillae, circular in outline, on one or both of these segments (xvi 

 and xx). In the spermathecal region other papillae are usually found to the outer 

 side of and touching those already described on segments viii and ix ; these are 

 circular, and include the lateral setal bundles ; there may even be two such papillae 

 on one side. Median papillae are often found in this region also, on the anterior part 

 of segments x, xi and (once) xii. 



Internal Anatomy : — Septum 4/5 is thin, 5/6-11/12 are moderately strengthened, 

 the rest thin. 



The gizzards, in segments v and vi, are large, firm, and globular. The calciferous 

 glands are two pairs, in segments xi and xii ; they are small, ovoid, well set off from 

 the gut, and with smooth surface, not lobed. The canal swells out to form the 

 intestine in xv, but is much narrowed again as it passes between the bulky prostates. 



The last hearts are in segment xii. There is a pair of large oblique vessels in 

 xiii, but these do not join the dorsal vessel as do the hearts, — certainly not at the 

 usual place, the hinder border of the segment. 



The micronephridia are scattered in the anterior segments. Behind segment x 

 they are arranged in regular transverse rows ; behind the prostates there are about 

 six on each side of each segment ; of these the more dorsal are in regular longitudinal 

 rows, while the two most ventrally situated are closer together and not so regular. 

 Towards the hinder end of the animal the innermost on each side in each segment 

 becomes much thickened and more opaque, and thus, though it takes up no more 

 space transversely, it is much more conspicuous than the rest. The other five main- 

 tain their number and regularity however to within a very few segments of the end. 



Testes and funnels, the latter of large size, are free in segments x and xi. Semi- 

 nal vesicles are present in segments ix and xii ; those in ix are small, those in xii 

 much larger, lobed, and bulging back septum 12/13. 



The prostates are large, the anterior pair extending over xviii and xix, or xvii, 

 xviii, and xix and even getting into xx ; the posterior pair occupies xx and xxi ; 

 thus they overlap. The glandular part consists of closely adpressed coils. The duct 

 is much thinner, though rather wider as it approaches its termination ; it is shining, 

 and thrown into one or two loops. Each duct leads forwards to end in the usual 

 situation. 



The spermathecae are two pairs, in segments viii and ix. The ampulla is ovoid, 

 of moderately large size, and shows slight annulation ; the duct is well marked off 

 from the ampulla, and is half as long and two-fifths as thick as the latter ; it narrows 

 towards its ectal end. The diverticulum is single, and consists of a large number of 

 minute seminal chambers, the whole attached by a short thick stalk to the ental end 

 of the duct (fig. 59). 



Penial setae are absent. 



