4 Mr. C. R. Narayan Rao on some 
Ot 
part of the body which is quadrilateral in cross-section 
bears dorsal and ventral wide and lateral, sometimes deep 
canals. ‘Total number of segments 270-385. The pre- 
clitellar segments, nearly twice the size of the postclitellar 
ones, bear a number of prominent secondary annular ridges 
and grooves. ‘The clitellar segments with the latero-ventral 
wings are the broadest and soft, bearing ventrally irregular 
grooves and ridges. ‘The number of segments surrounding 
the anus can hardly be counted, owing to extreme shortness. 
Anus a large longitudinal slit, dorsal in position, borne 
on a swollen cone or on the unmodified posterior region. 
- Prostomium pro- or zygo-lobous. 
Fig. 1, 
A seta (2) from the middle of body of Glyphidrilus fluviatilis, x 75, 
Dorsal pores absent. 
In the preclitellar region the seta-distance is aa, equal to 
or slightly less than dc or dd; be=dd ; ab=cd. In the post- 
clitellar region aa: ab:be:cd:dd=2:4:1:4:lior2. A 
seta from the preclitellar region measures nearly 0°75 mm, 
long and 0°12 broad. The skin is raised in a tent-like 
fashion over the seta in the middle and hinder part of body. 
The projecting part of the sete is ornamented by delicate 
annulations, and the stem embedded in the follicle bears a 
few irregularly-disposed spines, and the whole structure is 
marked by fine striations, the distance between any two 
strie being 1150 w. The first segment is free. 
