1910.] J. R. HENDERSON & G. Matruar: Freshwater Prawns. 291 
little beyond the antennal squame; the tooth-formula is it The 
large chelipedes are practically equal, and much shorter than the 
body; the spinules are weaker than in males, but retain the 
same characteristic arrangement. The lateral groove is well seen 
on the carpus, but it tends to assume a more dorsal position ; 
whether this is characteristic of all females cannot be determined 
as there is only a single specimen in the collection. ‘The pubes- 
cence on the fingers is similar to that in males but feebler. The 
joint-measurements of the chelipedes are as follows :— 
Peo auiteO aCe Le. Vp. Om bLGis- 
The entire surface excepting the chelipedes is smooth, but 
the telson is slightly rough. The following are detailed measure- 
ments of all six specimens :— 
Length of — é é 5 4 é 2 
body ee 79 82 82 84 93 71 
Rage lie: Rel Rel Stell beet Il uit Ge SS ROR 
chelipedes .- 83) 8675. 94°5 94 96:5 96 107°5 97 ~157 97 46:5 45:5 
ischium Me 2 ec TA ee ASN ees Trees Cheon Abe mts 8 
merus mor MAP GeiigiPG Sie Piy lees aes) ys Sy = WZ 0 PA IO) 6) 9 
carpus Boe e230 he 24k i 2Oue 20 ies 2055125 29°5 28 48 -20n b2c5e 12 
palm Se at Aap OSs Bi 2Ace Jee 2OL eee 2 AAe2 2 eLOs5 TO 
fingers Joe iL mie Wile ive By SRO Stee say 22202) OSes Ors 
Locality.—We have obtained this species only from Cochin. 
PALAEMON RUDIS, Heller. 
(Pl. xvii, figs. 5a—h.) 
PP. vudes, Weller, Vern. Z..5..Geselisch= Wien, p.527 (1862) - 
Ortnrann, copy 742 (189r); Coutiere, Anny des-Sei Nat. Ser. 8, 
taxi p-6286 (EQOL). 
P. mossambicus, Hilgendorf, Monatsb. Akad. Wiss. Berlin, 
p. 839, tab. iv, fig. 17 (1878). 
P. alcockt, Nobili, l.c., p. 9, fig. 5 (1903). 
Characters of adult males.—The rostrum which shows a moder- 
ate proximal convexity extends as far as the distal margin of the 
antennal squame, or a little behind it; the distal portion slopes 
. IO—I 
slightly downwards; the tooth-formula is — ae 
The first two 
teeth, as in P. 1d@, are on the carapace, and are separated by a 
wider interval than any of the others; as a rule the two distal 
teeth are closer together than any of the others. 
The large chelipedes are always unequal ; the longer chelipede 
is a little less than one-and-a-half times the length of the body ; 
the shorter chelipede is about five-sixths the length of the longer 
one. The chelipedes are everywhere pubescent, but this charac- 
teristic is less marked on the ischium, and most pronounced on 
the opposed margins of the fingers. The palm is practically 
cylindrical, and is the same width as the distal end of the carpus, 
or sometimes slightly narrower. The fingers are of equal thick- 
