TO INDIAN CARCINOLOGT. 441 



The rostral formulae are as follows : — 



Martaban. — Three specimens '-^, two specimens -^r-- 



HI- 1 T'- • 6 + 1 , . 5+1 . 5+1 . 0+1 



Madras. — iive specimens -^~, two specimens ~p, one specimen —n— one specimen ^— . 



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

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

 to i. lougirostris, 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 consideration 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 different known species of 

 this genus. 



261. Leander, modesttjs, Heller. 



L. modestus, Heller, 'Novara' Crust, p. Ill, Taf. x. fig. 6 (1865). 



Madras, six specimens {J. B. S.). 



The apical third or more of the rostrum is edentulous and upturned, while the 

 proximal part carries eight or nine small teeth ; three 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 tooth, while in Heller's figure the two are represented as placed opposite 

 each other. 



Distribution. Shanghai {Selle)'). 



Genus Pal^emon *, Fabricius. 



262. Pax^mon cakcinus (Fabr.). 



P. carcimis (Fabr.), Ortmann, Zool. Jahrb. Bd. v. Ahth. f. Svst. p. TOO, Taf. .\lvii. fig. 1 (1891). 



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

 Tavoy (jJai/) ; Burmah {Oates). 



The colour is characteristic, the clu_4ipedes, carapace, and abdomen being marked 

 with purple, as indicated in the figure of Herbst. 



The examination of a large series from (liffer(>nt localities has left me in considerable 

 doul)t as to tlio limitations of this species. I find great variation as regards tlie length 

 of the chelipcdes 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 both sexes the rostrum is scarcely 

 longer than the antennal scales, while the number of teeth is greatly reduced ; and, as 



* Thi^re arc several species of Pahtmon in the Day collection which are probably new, but I have not ventured 

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

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

 Bopyrid parasite, and .some time ap;o I forwarded a specimen, taken in fresh -water at ifadras, to Prof. Giard and 

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

 Archipelago. 



