1898.] A. Alcock — Carcinological Fauna of India. 173 



The abdomen of the male consists of five joints, the 3rd-5th somites 

 being fused. 



The species of this genus are at once recognized by the subcircular 

 carapace, which even in the male leaves the first two and part of the 

 third abdominal terga exposed in a dorsal view ; and by the remarkable 

 inequality aud dissimilarity of the chelipeds. 



Key to the species of Cymo. 



I. Carapace subcircular, depressed, but not quite flat : — 

 i. Wrists and hands studded with sharpish gra- 

 nules only : front bilobed, the edge of each 

 lobe denticulate : — 



1. Fingers white C andreossyi. 



2. Fingers black except at tip C. melanodactylus 



ii. Wrists and hands with large granular warts as 



well as granules : — 



1. Front bilobed, the edge of each lobe 

 concave and the angles in the form 

 of granular tubercles, so that the front 



appears four-lobed G. quadrilobatus. 



[2. Front not four-lobed C. tuber culatus.'] 



II. Carapace more elongate-pentagonal than subcircular, 



perfectly flat C. deplanatus. 



96. Cymo andreossyi, (Audouin) De Haan. 



Pilumnus? andreossyi, Audouin on Savigny's Descr. de l'Egypte, pi. v. fig. 5, 

 p. 86. 



Cymo andreossyi, De Haan, Faum. Japon. Crust, p. 22 : Dana, U. S. Expl. Exp. 

 Crust, pt. I. p. 225, pi. xiii. figs. 2 a-b : Stimpson, Proc. Ac. Nat. Sci. Phila. 1858, 

 p. 34: Heller, SB. Ak. Wien, XLIII. 1861, p. 346, and Novara Crust, p. 20 : A. 

 Milne Edwards, Noav. Archiv. du Mus. IX. 1873, p. 252 : Kossmann, Reise roth. 

 Meer. Crust, p. 35 : Miers, Phil. Trans. Vol. 168, 1879, p. 487, and Zool. H. M. S. 

 Alert, pp. 517, 582 : de Man, Archiv. fur Naturges. LIII. 1887, i. p. 291 : J. R. 

 Henderson, Trans. Linn. Soc, Zool., (2) V. 1893, p. 363 : Ortmann, Zool. Jahrb. 

 Syst. Vir. 1893-94, p. 443. 



Carapace almost circular, its greatest length being inappreciably 

 less than it greatest breadth, closely covered with a spongy fur on 

 removal of which can be seen (1) faint depressions demarcating the 

 gastric and cardiac regions and incompletely separating the gastric 

 region into three sub-regions, others subdividing the branchio-hepatic 

 regions into faintly convex areola?, and (2) a few granules on the 

 anterior part of the gastric region (in a transverse line) and on some 

 of the lobules of the branchio-hepatic regions. 



Frotit rather more than f the greatest breadth of the carapace in 

 extent, bilobed, separated from the dentiform supra- orbital angle by a 



