1912. | J. StEPHENSON: Indian Aquatic Ohigochaeta. 239 
ventral series are three per bundle in segments ii—xi, absent in xii 
and two per bundle behind this. The dorsal series are two per 
bundle throughout. 
The alimentary canal begins in a tubular buccal cavity lined 
by low, approximately cubical, epithelium. The pharynx suc- 
ceeds, and is in turn followed by the ciliated oesophagus, narrow 
as far as segment vi, a little wider in vii and viii ; its calibre finally 
increases in xiv where the tube becomes the intestine ; the cilia 
are specially long in segments vii—xi. Three pairs of septal glands 
are present, in segments iv, v and vi; their position would perhaps 
be more accurately described by saying that they are in close con- 
nection with septa 4/5, 5/6 and 6/7, which split to enclose them ; 
the posterior pair of glands are united ventrally underneath the 
oesophagus. Peptonephridia are present as narrow coiled tubes 
in segment iv. 
The dorsal vessel begins in segment xiii apparently, or at dis- 
sepiment 12/13. It divides just behind the level of the mouth; the 
two divisions unite again ventrally, probably in segment v, to 
form the ventral vessel. 
The nephridia are oi the compact type, with a small antesep- 
tal portion and a pear-shaped postseptal ; the latter twice as long 
as the anteseptal, the broad end anterior, the narrow end con- 
tinued into the duct, which passes downwards and backwards. 
The duct is about half as long as the postseptal portion, and duct 
and postseptal together are about twice as long as broad. The 
first nephridium is in segment v. 
The cerebral ganglion is large, in segment ii, and has the dor- 
sal vessel closely applied to it underneath. From sections it 
appears to be slightly convex behind, or at any rate not indented. 
Reproductive organs.—The testes are in xi, attached to 
septum 10/11; there are no sperm-sacs. The funnels are in 
xi; they are much smaller than is usual in the family, and do 
not diverge very greatly from the ordinary form; thus there 
is a small open funnel-like mouth, which is succeeded by a 
portion of the tube composed of columnar, clear and mucous-look- 
ing cells (cf. pl. xii, fig. 6, drawn from a specimen in cedar oil). 
The vas deferens passes through septum 11/12, is coiled in the 
anterior part of segment xii, but straight in its posterior por- 
tion ; it is very narrow, its diameter being 7-8. The penial body, 
in the posterior part of xii, is spherical, has a diameter of 40-45), 
and opens on the surface by a wide aperture (pl. xii, fig. 6). 
The ovary is attached to septum 11/12. Ova are found in all 
segments from viii to xii inclusive; segment xii may be largely 
filled by them (pl. xii, fig. 6). The funnel is a backward depres- 
sion of septum 12/13 on each side, at its ventral attachment to the 
body-wall, whence the short narrow oviduct leads directly to the 
exterior. 5 
The spermathecae open to the exterior in the intersegmental 
groove 4/5; the ampulla of each is small, approximately spherical 
or ovoid, in diameter about 30/; it probably communicates with 
