Crustacea Decapoda and Stomatopoda. 
281 
extend throughout the anterior two-thirds of the lower border, or may cease some 
little distance behind the apex. 
The cornea is proportionately larger than in any C. nilotica that I have seen, 
while the stalk is shorter and broader. In dorsal view the length of the cornea is 
greater than that of the stalk, whereas in C. nilotica subsp. gracilipes the reverse is the 
case. 
The preocular length of the antennular peduncle is at least 0 82 times the post- 
ocular length of the carapace. The lateral process is short, not reaching the end of 
the basal segment. The antennal scale is from 3*6 to 3 "8 times as long as broad ; the 
second segment of the antennal peduncle is produced distally as a spine immediately 
below the insertion of the scale. 
The carpus of the first peraeopods (text-fig. loh) is about 2-2 times as long as 
broad in the Patani R. specimens, from 2 4 to 2-6 times in those from Penang. The 
fingers are about 1-5 times the length of the palm.' 
In the second peraeopods (text-fig. loc) the carpus is one quarter longer than the 
chela and is from 4-9 to 5*8 times as long as broad. The fingers are about 1-5 times 
the length of the palm.' 
The last three pairs of peraeopods usually bear from 2 to 4 spines on the lower 
edge of the merus and, occasionally, one near the distal end of the carpus. The pro- 
podus of the third pair (text-fig. lod) is from 5*6 to 6-6 times as long as the total length 
of the dactylus in the Patani R. specimens, from 5 "5 to 5*8 (exceptionally 51) times 
in the case of those from Penang. Excluding the spines, which vary in number from 
5 to 7, the dactylus (text-fig. loe) is from 2'0 to 2'6 times as long as broad. In the fifth 
peraeopods (text-figs. 10/, g) the propodus is from 4-8 to 6-8 times the length of the 
dactylus; the dactylus is from 2*5 to 2*8 times as long as broad and bears from 29 to 
43 (usually 36 to 43) spinules. 
There are from 3 to 5 pairs of dorsal spines on the telson and from 8 to 10 at the 
apex. On the outer uropod there are from 12 to 14 movable spines. 
The eggs vary from 0-35 to 0-42 mm. in length and from 0-22 to 0'25 mm. in 
breadth ; they do not differ in size in specimens from the two localities. 
Large specimens reach a length of about 28 mm. In examples of 18 to 20 mm. 
in length the rostrum is not longer than in adults whereas in varieties of C. nilotica it 
is proportionately longest in adolescent individuals. 
The subspecies peninsularis is based solely on the character of the upper border of 
the rostrum ; in the subspecies the teeth extend along the whole length of this border, 
whereas in the typical form there is an untoothed portion close behind the apex. 
The few Patani specimens were obtained in the river in muddy water which was 
fresh though subject to tidal influence, while those from Penang came from a stream 
of clear water in the Botanic Gardens. In the latter locality they occurred in places 
where the flow of water was not very rapid and where the banks were not overgrown 
' The length of the palm is measured from the hindmost limit of the chela to the dorsal point of junction between 
palm and dactylus, the dactylus from its tip to the same point. De Man appears to have measured these segments 
differently. 
