I9I4-] J- Stephenson : Oligochaeta. 409 



tinct, except H ventrally. Dorsal pores are absent, but the setae 

 are present, except the ventral pairs of segment xvii. The body 

 is slightly constricted in the clitellar region. 



The male apertures are a pair of conspicuous transverse slits, 

 situated in a slight depression on segment xvii. The depression is 

 lighter in colour than the neighbouring clitellum, and the surface 

 around and between the apertures is wrinkled by a number of 

 small cracks. The slits extend internally beyond the line of setae 

 a, and externally beyond that of b, the centre of the slit being 

 between the two lines. 



The female apertures were doubtfull}^ represented, on the left 

 side only, by an ovoid depression anteriorly on segment xiv, 

 immediately in front and with its centre in the line of setae a. 



The spermathecal apertures are minute, in furrow I, in (on the 

 right) or just external to (on the left) the line of setae h. 



Septum ;t (?) is exceptionally thick, even for this genus; it is 

 conical in shape, with the small end backwards. After a con- 

 siderable interval follow septa ?,, xo, and li, all of which are also 

 thick. Septum W is missing, as in some of the species previously 

 described ; its position is indicated by a pair of hearts only. 



The gizzard, subspherical in shape, occupies the anterior part 

 of the space between septa ;! and f. A pair of large calcareous 

 glands occupy the whole of the elongated twelfth segment; these 

 are dark, hard and brittle, with internalh' a lamellated structure. 



The last heart is in segment xiii. 



The micronephridia behind the clitellum are arranged in 

 regular rows on the body- wall ; in segments xi-xvi they are irregu- 

 larly scattered, though numerous; they are few in front of xi, till 

 the anterior end of the body is reached, when they occur again as 

 numerous close tufts in segments iii and iv. 



The testes and funnels are enclosed in a pair of testicular sacs, 

 which are apparently not connected with each other; the parts 

 were very stiff, and the point was not definitely cleared up. The 

 sacs are in segment xi, attached to the posterior face of septum ir; 

 the contained funnels are large and iridescent ; the vas deferens 

 leaves the sac posteriorly. 



The vesiculae seminales are a pair of flattened structures, with 

 a granular surface, lying between the bod3'-wall and gut, and 

 occupying segments xii and xiii. With regard to their extent, 

 they are not bounded anteriorly by any septum, H being absent ; 

 and posteriorly they cause a backward bulging of rf , thus appear- 

 ing at first to occupy segment xiv as well. They are attached 

 closely to the alimentary canal, and, in the specimen examined 

 were hard and brittle, especially the anterior portion. 



The vas deferens is fairly easily followed on the body-wall ; 

 posteriorly it passes beneath the S-shaped part of the prostatic 

 duct, to be described immediately ; it ends posterior to the termi- 

 nation of this latter, after dilating and taking an inward turn. 



The prostate is tubular, and occupies three segments, xvii-xix. 

 The duct is not of greater diameter than the rest; it has an 



