1910.] J. STEPHENSON: Aquatic Oligocheta of the Punjab. 71 
where the ejaculatory duct was not yet formed (the atrium appear- 
ing as a rounded mass sessile upon the inner side of the body- 
wall), there were, in addition to the normal sete of the segment, 
small sete with the characteristic distal ends of the genital setz 
developing beside the normal sete in the body-wall. The genital 
sete (text-fig. 4) are shorter and stouter, as well as fewer in num- 
ber (e.g., three on each side) than the normal setz of the segment. 
The nodulus is very large and prominent, and near the distal end ; 
the distal end is blunt and not forked. ‘These sete vary some- 
what in shape, as for example in the degree of bluntness of the 
end, and they may or may not present a slight swelling just 
proximal to the tip. 
III.—On a SpPEcIES OF Devo FOUND IN LAHORE; A CONTRIBU- 
TION TO THE Dervo-QUESTION. 
A number of specimens of this form were discovered in the 
mud from a pond near the boarding house of the Government 
College, and were brought to my notice by Lala Bishambar Das, 
my demonstrator, in November, 1908. The pond has since been 
drained, and the form has not been met with again. 
External characters.—The animals were thin and filiform when 
extended, in length from 10 to I2 mm. Most of the animals 
were preparing to divide, and showed a zone of newly budded seg- 
ments about the middle of their length. The number of dis- 
tinguishable segments in each half of such an animal was about 
twenty. There were no eyes. The prostomium was bluntly coni- 
cal, and the posterior end of the body was slightly swollen in 
a club-shaped manner. The animals moved backwards quite 
easily. 
Gull-processes.—The anus opened posteriorly at the bottom of 
a funnel-shaped depression, the base of the funnel facing dorsal- 
wards. Ventral and posterior to the funnel, the posterior end of 
the body was prolonged into a pair of finger-shaped lobes, which 
could be curved dorsalwards and thus bent over the gill-processes 
about to be described, but were not completely retractile, though 
they could be appreciably shortened. ‘These processes were not 
ciliated, and did not contain blood-vessels : they bore a number of 
sensory “‘ hairs.’' 
On each side of the funnel, extending in a line forwards and 
dorsalwards from the posterior tactile processes just described, were 
four vascular gill-processes. These diminished in size from behind 
forwards, the most anterior being thus the smallest. All were 
rounded, tuberculated, ciliated, and vascular ; they were very con- 
tractile, and hence their appearance varied much from time to 
time. The smallest, most anterior gill on each side was a pro- 
jection of the margin of the funnel ; the other three appeared to 
be inserted just within the margin in such a way that when fully 
expanded the margin of the funnel disappeared as a continuous 
line, but when contracted the margin of the funnel appeared as a 
