300 Records of the Indian Museum. (VOL. oNe 
P, DOLICHODACTYLUS, Hilgendorf. 
(Pl. xviii, figs. 8a—b.) 
P. dolichodactylus, Hilgendorf, Monatsb. Akad. Wiss. Berlin, 
p. 640, taf. iv, fis. 18 (1878) -Ortman! ics p.2731 (1601) -sCou, 
tiere, Ann. Sci: Nat. Zool. t: xii, p. 283 (agox) - Nobili We Spare 
(1903). 
Characters of adult males.—The only points of difference that 
we have been able to discover between this so-called species and the 
last are as follows :—The carpus of the longer chelipede is usually 
longer than the merus; the palm is never wider than the distal 
end of the carpus, and in most cases is of the same width. The 
fingers are thinner than those of P. scabriculus and are much longer 
than the palm ; the velvety covering on the latter joint is continued 
to the proximal halves of the fingers. The median ridges bear 
more tubercles than in P. scabriculus, 25 to 32 on the mobile 
finger and 23 to 25 on the immobile; when closed the opposed 
margins of the fingers meet. 
A table of measurements of the large chelipedes in some 
specimens which appear to be adult is given on page 303. 
We have a male prawn from the Niiambur forest, measuring 
64 mm. in total length, which seems to connect P. scabriculus and 
P. dolichodactylus. The carpus and merus are of equal length, and 
the palm is a little longer than the fingers. The fingers are sub- 
equal and the velvety covering on the palm is continued on them 
for only one-third of their length; their opposed margins meet 
when closed. The mobile finger bears 22 tubercles, and the im- 
mobile one 17 in addition to the basal tooth. ‘The joint measure- 
ments are as follows :—- 
Bees vole cs p. m.f. im.f. 
Long chelipede ap Ons 15 26°5 24°5 25 
Short i Sele LO SO ro 12°5 235 
This specimen bears considerable resemblance to P. petersiz, 
Hilgendorf, from East Africa (Monatsb. Akad. Wiss. Berlin, p. 
841, taf. iv, fig. 19, 1878), and we are led to think that P. petersiz 
is perhaps only a connecting link between P. scabriculus and 
P. dolichodactylus. 
Localities—Many specimens from a river in the Nilambur 
forest in the Malabar district ; an adult male from Palghat; Madras; 
Walajabad. 
General distribution.—P. dolichodactylus has been recorded 
from the East coast of Africa, from Natal to Mozambique (Hilgen- 
dorf), Madagascar (Coutiére). Nobili records it from Pondicherry. 
PDO BIGGS. sae, 
(Pl. xviii, figs. ga—d.) 
Characters of adult males.—Again in this form we shall content 
ourselves by merely indicating the points of difference between it 
