1915.] J. STEPHENsoN : Indian Oligochaeta. 83 
are in 18/10 instead of 19/20,—oval depressions with whitish margins, their centre 
just internal to b, the whole pit extending from c to a or a very little further inwards. 
The gizzard takes up the posterior three-quarters of segment vii, and vii being 
a segment of considerable length the gizzard is thus of some size, certainly larger 
than in the former specimens; it is cylindrical, rather soft, but harder in its hinder 
than in its front part. The micronephridia are fairly numerous in front of the 
clitellum : behind the clitellum there can often be distinguished larger tufts, but these 
are not regularly present in each segment, are not visible to the naked eye and have to 
be searched for under the binocular; they would certainly not have been remarked 
in an ordinary dissection. The shape of the spermathecal ampulla was irregular in 
some cases, and in one case the diverticulum was bifid; the short stout ductis fairly 
well marked off from the ampulla. Penial setae as before. 
Megascolex hortonensis, sp. nov. 
(Plate VIII, figs. 19-20.) 
Horton Plains, 7000 ft., Ceylon; under stones and logs; Dec., 1913 (S. W. Kemp). A single speci- 
men, injured near the anterior end. 
External characters.—Length 72 mm., maximum diameter 3 mm.; colour light 
grey throughout. Segments 141. 
Prostomium prolobous. 
Dorsal pores begin from groove 8/9 or in front of this (the injury obscures this 
region). 
The setal rings are broken dorsally and ventrally; 22=2yz, but as the setae are 
not very numerous the interval is actually of fair extent; ventrally aa—21ab. The 
setae are larger in the anterior part of the body in front of segment viii, and are also 
somewhat enlarged again at the hinder end. They are arranged in fairly regular 
lines, especially a, band c, but not in pairs; ab=24bc. The numbers are iv/20, v/20, 
vii/22, xiii/22, behind clitellum 24, and in the posterior part of the body 28. 
The clitellum extends over segments xiv-xvi=3. Itissmooth, of the same colour 
as the rest of the body, with very slight indications of the intersegmental grooves; 
the setae are just visible in places, but dorsal pores are absent. It is delimited at 
both ends by a very definite constriction. 
The male genital area (fig. 19) is an almost rectangular thickened patch, taking 
up the ventral surface of xvii, xviii and }xix. In this area are distinguishable— 
(a) a pair of conical pointed penis-like projections (pen.), somewhat compressed antero- 
posteriorly, near the lateral border of xviii, and slightly behind the middle of the 
length of the segment; (b) a pair of circular depressions (pif), one on each side of 
the middle line, on the anterior part of xviii, internal to and slightly in front of the 
pores, near each other, and connected together by a transverse crack; (c) a pair of 
flat oval areas (pap.) at the postero-lateral corners of the rectangle, scarcely raised 
above and yet sufficiently well marked off from the rest of the field. No setae are 
visible on the male area. The penes are about 4 of the circumference apart. 
