358 Carcinolngical Fauna of Jndia. 



Edwards. Hist. Nat. Crust. II. 52, and Ann. Sci. Nat., Zool., (3) XVIII. 1852, p. 117, 

 pi. iii. fig. 9 : Gaerin, Voy. Coqaille, II. Zool., Crast. p. 10, pi. i. figs. 2, 3 : A. Milne 

 Edwards, in Maillard's I'ile Reunion, Ann. F., p. 6, and Nouv. Archiv. du Map. IX. 

 1873, p. 273 : Heller, Novara Crust., p. 37 : Hilgendorf, in v. d. Decken's Reiseii Ost- 

 Afr. Crust, p. 84 : Hoffmann, in Pollen and Van Dam, Faun. Madag. Crust, p. 16: 

 Kossniann, Reis roth. Meer. Crust, p. 52 : Kingsley, Proc. Ac. Nat. Sci. Piiilad. 

 1880, p. 143, pi. is. fig. 11 : de Man, Arcbiv f. Naturges. LIII. 1887, i. p. 353, and 

 Notes Leyden Mus. XIII. 1891, pp. 20, 24, pi. ii. fig. 6 : Ortmann, Zool. Jahrb. Syst. 

 Vir. 18i)3-94, pp. 750, 754: Whitelegge, Mom. Austral. Mus. III. 1897, p. 138. 

 Oelas'imus Duperreyi, Guerin, Dana U. S. Expl. Exp. Crnst. pt. i. p. 317. 

 Uca tetragona, Ortmann, Zool. Jahrb., Syst. X. 1897-98, p. 318 : Doflein SR. 

 Ak. Miinch. XXIX. 1899, p. 193. 



Length of tlie carapace about two-thirds of iis greatest breadfcli 

 at tlie acute antei'o-lateral angles. Carapace ."^omewhat pentagonal, 

 markedly convex fore and aft, the regions all recogaizable but not 

 strongly defined : though the posterior border of its doisiim is only 

 half its greatest breadtli, the true lateral bordei-s are but slightly 

 convergent posteriorly. In the adult male the fine raised line that 

 bounds the doisal plane on each side is distinct as such only in the 

 neio-hhourhood of the antero-latei'al angles, but in the female it runs 

 much further backwards. 



The breadth of the front, measured between the bases of the 

 evestalk.s, is about a tenth the greatest breadth of the carapace. 



Orbits much oblique, both borders sinuous, the lower border 

 eleo-antly denticulated throughout. 



In the large cheliped of the adult male the upper border of the arm is 

 fairly prominent and the inner border ends in a sharp tooth, quite inde- 

 pendent of the constricted-off terminal lobule ; the wrist is quite smooth 

 to the naked eye, and has the inner angle sliarp but not spiniform ; 

 and the hand is about 2| times the greatest length of the carapace. 



In the hand of this cheliped the palm is, to the naked eye, frosted 

 with very fine granules, some of which in the neighbourhood of a scar 

 near the base of the immobile finger are visible to the naked eye ; its 

 upper border is not, and iis lower border is but obscurely, defined ; and 

 tlie two oblique crests on its inner surface are mere swellings, often 

 quite faint, and never strongly salient. Tlie fingers are neither broad 

 nor particularly thin : the dactylus, Avhich is about If times the length 

 of the upper border of the jialm, tapers and is somewhat hooked at 

 tip; the immobile finger commonly has two teeth a little enlarged, the 

 second one being near the tip and sometimes giving the tip a somewhat 

 notched (but not truncated) appearance. 



The merus of the last pair of legs is not at all foliaceous. 



In the Indian Museum are 29 specimens from the Andamans: 

 the carapace of a large one is 17 millim. long and 26 millim. broad. 



700 



