1910.] J. STEPHENSON: Aquatic Oligochata of the Punjab. 73 
The ventral seta (text-fig. 8) were of the usual double-curved 
and forked type, usually four, occasionally two 
or three in a bundle; the bundles began in the 
second segment. Two types were distinguish- 
able; those of the second, third, and fourth 
segments had the prongs of the fork of the same 
thickness at their base, and the distal prong half 
as long again as the proximal; in the remaining 
segments the prongs were almost equal in length 
(the proximal being possibly very slightly the 
longer), and the proximal was twice as thick 
as the distal at its base. The length of the 
x setee varied irom ‘06 to ‘05 mm., those of the 
anterior segments being slightly longer than 
Fic. 8.—Ventral those of the posterior; the thickness was about 
seta from a poster- thesame, 2°2 » throughout. 
ior segmentof Dero 
sp. 
The position of the nodulus was found to vary regularly in 
each bundle. ‘This may be illustrated by the following tables :— 
(a) Setal bundle of iv segment— 
Total length. Prox. to nodulus. Distal to nodulus. 
"058 ‘026 "032 
"058 "029 "029 
"062 "032 "03 
054 "032 "O21 
(b) Setal bundle of a posterior segment— 
Total length. Prox. to nodulus. Distal to nodulus. 
056 ‘026 "029 
056 “029 020 
"057 "035 "022 
053 "035 ‘018 
The series in each case begins from the innermost seta of the 
bundle. It will be seen that in each bundle the inner seta has the 
nodulus proximal to the middle of its length, while in the outer 
seta the nodulus is markedly distal; and that the intermediate 
setee show intermediate conditions. 
Lymph corpuscles may be present or absent, and when present 
they were of two kinds. Both were spherical; but one variety 
contained a number of shining white granules, while the other con- 
tained a small number of fairly large yellow refractile spheres, 
looking like small oil droplets. These two kinds of corpuscles were 
similar to those described for the Punjab variety of Nats variabilis 
[11] (plate viti, fig. 6). 
Alimentary canal.—The pharynx occupied segments it, iti and 
iv, and the cesophagus v and vi. Around the cesophagus, in seg- 
ments v and vi, were lobular hyaline masses somewhat resembling 
the ‘‘septal glands” of Pristina. ‘There was no distinct stomach ; 
