68 Records of the Indian Museum. [VOL. V, 
something apart from the ova. I have not seen any trace of 
female apertures in my specimens. 
The spermathecee are in the fifth segment, opening externally 
not far behind the level of septum 4/5. At first they are small, 
somewhat pear-shaped or sausage-shaped, extending vertically up- 
wards. Later they become much elongated, and extend back- 
wards into the seventh segment, being contained within the cavity 
of the sperm-sac. In this stage they are full of spermatozoa; the 
wall of the receptacle is thin, and its cavity sharply marked off 
from that of the passage to the exterior, where the lumen is very 
narrow, and the wall thick (fig. 1). 
The clitellum forms after the sperm-sac has developed, but 
before the spermathecee and male ducts. When fully formed, it 
includes segments v, vi and vii, ending by a fairly definite margin 
both in front and behind. It consists of a single layer of cells, 
much larger and taller than those over the general surface of the 
body ; these cells in sections prepared in the usual way are seen to 
have their nuclei near their base, while the greater part of the re- 
mainder of the cell shows a large vacuole (fig. 1). On examining 
the surface of the clitellum in the living animal, it is seen to be 
tuberculated, and each tubercle appears to be compounded of a 
number of smaller ones: the large tubercles seem to correspond to 
individual cells, while each smaller tubercle corresponds to a 
circular refractile particle, of the same appearance as the glancing 
particles of yolk in the ripe ovum; when the animal breaks up 
under examination, the disintegration of the clitellum gives rise to 
a number of circular masses, each compacted of a number of these 
particles ; these masses appear to be each a portion of an epithelial 
cell of the clitellum,—the superficial portion apparently, which in 
the prepared sections is represented by the vacuole and surround- 
ing cell-substance. The appearance of the surface of the clitellum 
under an oil-immersion lens is represented in plate vill, fig. 2. 
‘The genital setae are described in the paper already referred to. 
Chetogaster orientalis, mihi (plate viti, fig. 3). 
When I first [10] gave a description of the present species of 
the genus Chetogaster under the specific name pelluctdus (which I 
have since learnt was preoccupied), I had only had the oppor- 
tunity of observing the sexual organs in asingle specimen. Ihave 
now to give a more complete description, as well as to correct 
certain errors of interpretation in my former paper. 
The specimens on the examination of which the present 
account is founded were obtained near Lahore in February and 
March, 1908. Other sexually ripe specimens have been obtained 
from Shalimar during the present month, March, 1909. The animals 
therefore, like the Nats previously described, have their period of 
sexual maturity in the early part of the year in this climate. 
Both sexual and asexual reproduction may go on together. 
This is noted by Piguet [9] for C. diastrophus, which, according to 
