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By J. StePpHENSON, M.B., D.Sc. (Lond.). 
I.—On Lahoria, A NEW GENUS OF THE NAIDIDA ALLIED TO 
Branchtodrilus, Mcuusn. (Chetobranchus, Bourn®). 
The worm of which the following is a description shares with 
Branchiodrilus the remarkable peculiarity of the possession of gill- 
processes on the anterior part of the body; the hair-setze of the 
dorsal bundles are contained within the more anteriorly situated’ 
gills; but further back, though still in the region of the gills, a 
certain number of these setz project freely. 
Branchtodrilus sempert, the only species of the genus origin- 
ally named Chetobranchus by Bourne, was found by him in a tank 
in Madras town [2]. It has not since then (1890) been recorded’ 
from any place in India, nor has it since been encountered at all’ 
under what may be described as natural conditions; though “Bed- 
dard [1] has found specimens in the Victoria regia tank at the 
Botanical Society’s Gardens in Regent’s Park. The chief difference 
between this form and the one now to be described, and the feature. 
which makes it necessary to constitute a new genus for the recep- 
tion of the latter, is the absence of gills and dorsal sete from the 
most anterior segments (ii-v) in the present form, and their pres- 
ence on these segments in the form described by Bourne. 
Lahoria hortensis, sp. nov. 
The worm was found in a small pond in the Lawrence Gardens, 
Lahore. This pond is artificial, having been first made about two 
years ago; it is kept supplied with canal-water by a small irriga- 
tion channel, and has been for some time overgrown and almost 
choked up with aquatic plants. The specimens were first obtained 
early in July, 1908. The animals lived then in fair numbers on 
and amongst the water-weeds near the edge of the pond, and it 
was not difficult to obtain specimens by passing a small net through 
this vegetation. One or two samples of mud from the bottom of 
the pond did not seem to contain any of these worms. Specimens 
were also found later in the year in the same place. 
External characters (plate vii, fig. 1)—The worms are usually 
from about two-thirds of an inch to an inch, or 16—25 mm. in 
length, and less than a millimetre in diameter, on an average ‘5 to 
"75mm. ‘The number of segments varies considerably ; specimens 
which were not preparing to divide showed from 90 to 120 
