Ig16. | J. STEPHENSON - [ndian Oligochaeta. 313 
me to be probably at the inner margin, but I will not say that they 
might not be at the outer margin with almost equal probability. 
Megascolides oneilli, Stephenson var. monorchis, var. nov. 
Darjiling to Soom, 7000-5000 ft., E. Himalayas, 14-vi-1914 (F. H, 
Gravely). A single specimen. 
External Characters.—Length 115 mm., maximum breadth 
5mm. Colour pale buff, somewhat mottled on dorsal surface and 
towards posterior end. Segments 188; segments iv, v biannular, 
the rest triannular as far as some distance behind the male pores. 
Prostomium prolobous. 
Dorsal pores very obvious, from groove 9/10 onwards. 
Setae very small, paired. Behind the clitellum the relations, 
expressed in terms of the distance ab, are:— aa=3- 4ab, bc is 
rather less than aa and = 3a), cd = 2ab or rather less further back. 
In front of the clitellum aa is rather less, > or = 2a), bc =or < 3ab, 
cd as before = 2ab. The interval dd = 2 circumference, or nearly. 
The clitellum was indistinguishable. 
The male pores are on segment xvii. Ventrally this segment 
presents a somewhat thickened pad, extending laterally rather 
beyond c, and taking up the whole length of the segment in an 
antero-posterior direction. The apertures are minute, between the 
lines of setae a and b. Secondary furrows are present in front of 
and behind the apertures, somewhat as in the typical form. Setae 
cd of xvii are present, but ab are absent. The anterior two-thirds 
of the ventral surface of xviii is also thickened, and the ventral 
setae are absent. 
The female apertures are not visible. 
The spermathecal apertures are in line with a, in grooves 6/7 
and 7/8. 
Internal Anatomy.—Septum 5/6 is thin, 6/7-9/10 are much 
strengthened, Io/11 and 11/12 somewhat strengthened, and the next 
few decreasingly thinner. 
The gizzard is large and barrel-shaped, in segment vi, and is 
preceded by a soft dilated crop-like portion of the oesophagus. 
Well-marked calcareous glands are present in segments vili- xii; 
each is kidney-shaped, well set off from the gut, and contained 
within the curve of the corresponding heart. The intestine begins 
in xiv; there is a conspicuous typhlosole of a curious appearance, 
characterized by possessing numerous closely set transverse folds 
along each side. 
The last heart is in xii. 
There are large tufts of micronephridia by the side of the crop, 
but in general the nephridia in the anterior part of the body are 
minute and scattered. At the posterior end of the body the 
arrangement is different; meganephridia are present in addition 
to micronephridia, as very slender and much elongated loops. 
The meganephridia are not seen in any number on the bodywall 
on pinning out the animal, since for the most part they remain 
