1908.] W. MiCHAEi^SEN : Oligochœta of the Indian Empire and Ceylon. 151 



Setse very small, very strictly paired. Median ventral distance about as large as 

 the middle lateral distances, median dorsal distance about as large as lialf the circum- 

 ference of the body {aa = ca. be, dd = C2i. ^ u). 



Nephridial pores in the lines of setse cd 



Dorsal pores apparently absent. 



Clitellum ring-shaped, occupying the segments ^ g — 14 (=5^), at the ^ of gth 

 and at the 14th segment distinct, but somewhat less marked. 



Male pores on the intersegmental furrow lo-ii, a little lateral from the lines 

 of setae b, in the centre of hexagonal, apparently not glandular, depressions, the medial 

 edges of which touch the imaginary lines of setse b. 



Female pores small, but distinct, on the intersegmental furrow 11- 12 in the 

 lines of setse ab. 



Spermathecal pores one pair, on the intersegmental furrow 7-8 in the lines of 

 setse cd. 



Internal Anatomy. — Septa 6-7 — 8-9 thickened, moderately strong, 8-9 very 

 tender, pushed backwards very far, the following tender. 



Alimentary tract: (Ksophagus simple, without any trace of a gizzard in 

 the anteclitellar region. Even in sections no thickening of the muscular layer 

 can be seen in any part of the œsophagus. Thus we cannot speak even of a rudi" 

 mentary gizzard in the anterior part of the œsophagus. Five strongly muscular 

 gizzards in segments 17 — 21. The size of the gizzards is very different, the fourth is 

 the largest, the third slightly smaller, the second and first gradually distinctly smaller, 

 the fifth the smallest of all, nearly rudimentary. In two opened specimens from 

 different localities, this arrangement was likewise found, but in that from Kodaikanal 

 the smallest (fifth) gizzard was even more minute than in the examined specimen from 

 Tiger Shola. 



Circulatory system: Dorsal vessel simple. Last hearts in the 9th segment. 



Nephridial system meganephric. 



Male organs: A pair of large egg-shaped testicular vesicles depend backwards 

 from the pushed back septum 9-10, thus in situ lying further back than what seems to 

 be the real position, the hinder parts of these organs being pressed against the anterior 

 ends of the egg-sacs. These testicular vesicles enclose the sperm-duct-funnels, which 

 may be seen shining through the thin walls of the vesicles as PERRIER saw them in 

 M. deshayesi, and doubtless also the testes, as in all other exactly studied species of 

 Moniligastndœ. From the anterior poles of the testicular vesicles arise the tube-like, 

 enormously long sperm-ducts. The greater middle parts of the sperm-ducts form a 

 great number of long narrow loops, the branches of which are closely united and which 

 have the appearance of densely crowded villi, depending forwards from septum 9-10 

 into the 9th segment, only the somewhat narrower proximal ends and the distal ends 

 of the sperm-ducts are free, not forming narrow loops, but irregular windings. Doubtless 

 the " feuillets d'apparence glandulaire," which are " formés par un ou plusieurs 

 tubes entortillés" of M. deshayesi, PERRIER (/• c, pi. iv, fig. 81 n et fig. 83), are 

 nothing but such loops of the sperm-duct, somewhat more complicated than in the 



