TO INDIAN CARCrN'OLOOY. 441 



The rostral formulse are as follows : — 



Martabau. — Three specimens '\- , two specimens -^. 



TIT 1 T?- • 6 + 1 , . 5 + 1 . 5 + 1 . 6 + 1 



Madras. — hive specimens -^ , two specimens -t-, one specimen -n— one specimen -g- . 



This species iu some respects, as in the form of the rostrum, the compressed abdo- 

 minal segments, the small antennal spine, and the form of the hand and fingers, is allied 

 to X. longirostris, but may be distinguished at once by its greatly elongated and exces- 

 sively slender legs, the form of the second legs, telson, antennal scales, &c. I at first 

 felt inclined to establish a new genus for its reception, but on further consi(hn'ation I 

 think it better to regard it as an aberrant species of Leander, for all its more important 

 structural features are such as vary considerably among the ditferent known species of 

 this genus. 



261. Leander modestus. Heller. 



L. modestus, Heller, 'Novara-" Crust, p. Ill, Taf. x. fig. G (18G.5). 



Madras, six specimens {J. Jl. II.). 



The a2:)ical third or more of the rostrum is edentulous and upturned, while the 

 proximal part carries eight or nine small teeth ; tliree teeth are found on the lower 

 margin, the most distal of which in all my specimens is placed in advance of the most 

 distal upper tootli, while in Heller's figure the two are represented as placed opposite 

 each other. 



Disiribuitoii. Shanghai [Reller). 



Genus Pal.emon *, Fabricius. 



262. Pal^mon caecinus (Fabr.). 



P. carcinus (Fabr.), Ortmaim, Zool. Jahrb. Bd. v. Abtli. f. Syst. p. 700, Taf. xlvii. fig. 1 (1891). 



A large series from Bombay; Ganjam; Calcutta ; Sunderbunds ; Sittoung, Burmah ; 

 Tavoy {Ban) ; Burmah (Gates). 



The colour is characteristic, the chelipedes, carapace, and abdomen being marked 

 with purple, as indicated in the figure of Herbst. 



The examination of a large series from different localities has left me in considerable 

 doubt as to the limitations of this species. I find great variation as regards the length 

 of the chelipedes in adult males, and the length and toothing of the rostrum, in speci- 

 mens taken along with, and which I cannot separate from, the typical form. In some 

 specimens from Bombay, Madras, and Ganjam, in lx)th sexes the rostrum is scarcely 

 lono-er than the antennal scales, wliilc the number of teeth is greatly reduced ; aiul, as 



* There are sevt-ral species of Pnhnnon iu the Day collection which arc probably new. tiut I have not ventured 

 to characterize them, owing to deficiency of material ; nor have I as yet attempted to identify my lladras specimens. 

 An example from Ganjam {Day), without chelipedes, and which, therefore, cannot bo satisfactorily identified, carries a 

 Bopyrid parasite, and some time ago I forwarded a specimen, taken in fresh water at, Madras, to Prof. Giard and 

 M. Bonnier, with a similar parasite. These authors have recorded two freshwater Bopyrids from the Malay 

 Archipelago. 



