1910.| J. R. HENDERSON & G. Marruar: Freshwater Prawns. 289 
It is to be noted from the above table that the two Mangalore 
specimens, though only 67 and 73 mm. in total length, yet possess 
adult characters and their chelipedes are relatively longer than 
those of the Malabar specimens. They may, therefore, be regarded 
as a smaller variety of P. ide. Numbers IX and X, though with 
shorter body-length than No. XI, have longer chelipedes and in 
No. X, the propodus is slightly longer than the carpus. The latter 
was the only example out of a large number examined, of about 
the same size, which exhibited this peculiarity. 
Localities. —Western India. Several specimens of both sexes 
from South Canara District (Mangalore), Malabar District (Calicut, 
Palghat), Cochin State (Koll Lands, Cochin), Travancore (Kot- 
tayam). 
General Distribution —P.id@ has been recorded from Mada- 
gascar (Coutiére), Zanzibar (Hilgendorf), Dar-es-Salaam (Ortmann), 
Seychelles and Mauritius (Richters), Ceylon (Heller), Singapore 
(von Martens), Sumatra (Nobili), Java (von Martens, de Man, 
Thallwitz), New Guinea (Nobili), Borneo (Heller), and the Philip- 
pines (von Martens, Thallwitz). It is recorded from the sea at 
Java by de Man. 
P. sundacus has been met w.th in the following localities :— 
Madagascar (Coutiére), Natal, in the sea (Max Weber), Mozam- 
bique (Hilgendorf), Zanzibar (Grandidier), Java (Heller, de Man), 
Flores and Celebes (de Man). 
PALAEMON SULCATUS, un. sp. 
(Pl. xvi, figs. 4a—g.) 
We refer six specimens from Cochin to this new species, of 
which one is a female and the rest males. Though possessing some 
points in common with P. ide, they can yet be distinguished from 
the latter by certain well-marked differences. 
Characters of adult males.—In the largest specimen measuring 
93 mm. and in another measuring 84 mm. in total length, the ros- 
trum shows some resemblance to that of P. 7d@, but the proximal 
portion of the upper margin is only very slightly convex, and the 
rostrum extends nearly as far as the distal margin of the antennal 
12 
6 
specimen measuring 79 mm. the upper margin is almost straight 
squame, with the tooth-formula and ~~ respectively. Ina third 
bf 
: Wiggers : 
with the tooth-formula Fa in the fourth specimen measuring 
82 mm. the proximal portion is straight, but the distal portion is 
turned up, with the formula a 
B ] 
in the fifth specimen, the rostrum 
extends beyond the distal margin of the squame, and is consider- 
ably upturned distally, the three distal teeth are very close to each 
other, the fourth and fifth teeth are separated by a much wider 
