1916. | J. STEPHENSON: Indian Oligochaeta. 
WwW 
23 
The clitellum, not very distinct, extends over xiii- xvii = 5; 
the body is rather narrower here. 
The male apertures, not very close together on segment xviii, 
are situated on small porophores which are slightly depressed and 
turned inwards towards each other, so that the apertures point (in 
the normal position) inwards as well as downwards. ‘The papillae 
are separated from each other by a small median groove, and are 
bounded in front and behind by transverse grooves, but are not 
delimited from the general surface at their outer border. 
The female pore is a conspicuous round aperture on segment 
xiV, midway between the row of setae and the anterior border of 
the segment. 
The spermathecal apertures, in furrows 7/8 and 8/g, are close 
together near the middie line. The grooves are obliterated at the 
situation of the pores, which are level with the general surface. 
Internal Anatomy.—Septum 4/5 is extremely thin, 5/6 and 6/7 
are thin, 7/8 and 8/9 slightly thickened, and the rest thin. 
The gizzard, in segment vi, is small, rather square in shape, 
soft, and rudimentary. Moderately large kidney-shaped calcareous 
glands are present in xiii, in xi and xii there are lateral enlarge- 
ments of the oesophagus which are not set off fromthe tube. The 
intestine begins in xvi. 
The last heart is in xii. 
The excretory system consists of meganephridia, the openings 
of which do not alternate. 
Testes and large male funnels are free in segments x and xi. 
Vesiculae seminales are present in xi and xii; the sacs in xi are 
large and meet dorsally but do not unite; those in xii are united 
and prolonged backwards through xiii. 
The prostates, in segment xviii, are rather small, compact and 
squarish masses, not cut up into lobes. The soft short duct lies 
curled up in a hollow on the inner and under side of the gland: it 
becomes broader towards its ectal end. 
The ovaries and funnels occupy the usual situation. 
The spermathecae are considerable sacs, of an irregular ovoid 
shape, with, in cases, small wart-like projections. The duct is short 
and stout, and there is no diverticulum. 
The penial setae (fig. 16) are in length ‘83 mm., in breadth 20, 
at the middle of the shaft, and 18, nearer the distal end. ‘Theshaft 
is almost straight, the tip slightly curved and pointed. ‘The distal 
end is ornamented with about twelve rings of narrow, comparative- 
ly long spines. 
Perionyx sp. 
(Plate xxxt, figs. 17, 18): 
Peradeniya, Ceylon, 26-vi-1910 (E. S. F.). A single specimen. 
External Characters.—lLength 8 mm., maximum diameter 1 mm, 
According toa note in the tube, the ground colour of the living 
worm was whitish, and each segment was girdled with a broad 
