362 A. Alcock — Carcinological Fauna of India. [No. 3, 



Gelasimus longidigitum, Kingsley, Proc. Ac. Nat. Sci. Fhilad. 1880, p. 144, pi. ix. 

 figs. 10, 13 {fide Ortraann I. c. infra). 



Uca Dussumieri, Ortmarm, Zool. Jahrb , Sysfc., X. 1897-98, p. 348 : Nobili, Ann. 

 Mus. Genov. (2) XX. 1899, p. 273 : Doflein, SB. Ak. Munch. XXIX. 1899, p. 193. 



Closely related to G. acutus, from which it can be distinguished by 

 the following characters when fully adult males are compared : — 



(1) the regions of the carapace are much more strongly defined, and 

 the raised lines that bound the dorsal plane of the carapace on each 

 side are more curved, less rapidly convergent, and less distinct in their 

 posterior part, which gives the carapace a much less posteriorly-con- 

 tracted look ; and the orbits are less oblique : 



(2) the front, measured between the bases of the eyestalks, is about 

 a fifteenth the greatest breadth of the carapace, and its moulded and 

 bevelled edges together take up more than two-thirds of its breadth : 



(3) in the large cheliped the arm is longer and more slender, both 

 the oblique granular ridges on the inner surface of the palm are very 

 strongly defined, and the fingers may be fully 3 times the length of the 

 upper border of the palm : 



(4) these large fingers are broader and thinner, their tips are 

 somewhat hooked and have no enlarged tooth near them, but near the 

 middle of the immobile finger there is a enlarged tooth or triangular 

 lobe : 



(5) the merus of the last pair of legs, though it is compressed and 

 somewhat broadened, is not a short foliaceous joint. 



In the Indian Museum are 52 specimens, from Mergui, Andamans 

 and Nicobars, and Bimlipatam. 



57. Gelasimus Urvillei, Edw. 



Gelasimus Urvillei, Milne Edwards, Ann. Sci. Nat., Zool., (3) XVIII. 1852, p. 148, 

 pi. iii. fig. 10 : Kingsley, Proc. Ac. Nat. Sci. Philad. 1880, p. 145, pi. ix. fig. 15 : 

 de Man, Notes Leyden Mus. XIII. 1891, pp. 21, 34 : Ortmann, Zool. Jahrb., Syst., 

 VII. 1893-94, p. 750. 



Gelasimus Dussumieri, Hilgendorf (nee Edw.), in v. d. Decken's Reis. Ost-Afr. 

 Crust, p. 84, pi. iv. fig. 1. 



This species closely resembles G. acutus and G. Dussumieri, but is 

 distinguished from both by the presence of a raised row of granules 

 behind and parallel with the middle third of the lower border of the 

 orbit — i.e., just inside the orbital cavity. 



As in G. acutus, the fine raised lines that define the dorsal plane of 

 the carapace laterally are distinct throughout and rapidly convergent, 

 which gives the carapace a look of breadth in front and of unusual 

 narrowness behind ; and, as in G. acutus, the meropodites of the last 



