154 Memoirs of the Indian Museum. [Vol. I^ 



more than twice as wide (the variety) as the width of the pairs (at the posterior end 

 dd = 2 — 3|- cd) . 



First dorsal pore on the intersegmental furrow 12-13, if not more anteriorly. 



Clitellum not developed in any of the present specimens. 



Male pores on large transversely oval papillae on the middle zone of the i8th 

 segment, opposite the setae a and h, surpassing the lines of the latter distinctly, of 

 the former hardly. The male papillae are connected with one another by a narrow, 

 median, transverse, apparently somewhat glandular, but not prominent bridge, and 

 (only in the typical form ?) surrounded by a common dumb-bell-shaped wall. 



Female pores before the setae a of the 14th segment, but a little further medial. 



Spermathecal pores two pairs, those of each side approximated to one another 

 more or less (in the variety nearly uniting), between the lines of setae a and h or in the 

 lines of setae a, the hind pair in the intersegmental furrow 8-9, the 'fore pair on 

 segment 8, in the zone of setae (typical form) or close to the intersegmental furrow 

 8-9 (the variety). 



Copulatory organs not present. 



Internal Anatomy (principally examined in the specimen of the variety) • 

 The septa of the anterior sexual region, from about 6-7 — 12-13, somewhat thickened, 

 especially the middle ones. 



Alimentary tract : A big gizzard in the 6th (5th ?) segment. There are no calci- 

 ferous glands set off from the œsophagus, but in the six segments 12 — 17 the œsophagus 

 is swollen segmentally, narrowed intersegmentally, moniliform, with rich blood-supply 

 and internally with a longitudinal lamellar structure. Intestine without typhlosole. 



Nephridial system meganephric. The meganephridia are relatively small. 



Anterior male organs : Two pairs of sperm-duct-funnels free in the loth and 

 nth segments ; two pairs of sperm-sacs, depending from septum 9-10 into the 9th seg- 

 ment and from septum 11-12 into the 12th segment. The latter (posterior sacs) 

 are the larger, and consist of a number of globular or oval and pear-shaped parts of 

 various sizes. Those of the anterior pair are smaller and their partitions less numerous. 



The prostates are tubular. The glandular part is long and rather thick, coiled; 

 the duct is rather short and narrow, nearly straight. There are nopenial setae, 

 but a moderately strong transverse muscle-band, converging towards the male pores. 



Spermathecae (fig. 9) : Main pouch with an oval or thickly tubular ampulla, 

 and a duct about as long as the ampulla, but only half as thick, and not very abruptly 

 set off from the ampulla. Distally this duct narrows rapidly. Somewhat beneath its 

 middle opens a simple, shortly tubular, straight or bent diverticulum which is about 

 as long as the duct or even somewhat longer ; this diverticulum contains a simple 

 seminal chamber, which occupies nearly all its length. 



Two different forms of this species may be distinguished : — 



F. TYPICA. 



Setae: Median ventral and dorsal distances larger than in the variety ; anteriorly 

 aa = ^ab, at the hinder end aa = 2ab and dd=2^ cd. 



