1900.] A. Alcock — Carcinological Fauna of India. 441 



2. Buccal cavern elongate : exognath of external maxil- 

 lipeda with a flagellum : no hairy fringe on the basal 



joints of the 2nd and 3rd pairs of legs Carjdioboma. 



IT. Fron to-orbital border less than half the greatest breadth of 

 the carapace : interantennnlar septum narrow : epistome 

 ill-defined and sunken : dactyli of legs with 6 rows of 

 spines : exognath of external maxillipeds without a 

 flagellum Pelocarcinus. 



Grapsodes, Heller. 



Grapsodes, Heller, Novara Crust, p. 58 : Kingsley, Proc. Ac. Nat. Sci. Philad. 

 1880, pp. 188, 197. 



Carapace depressed, little broader than long, declivous anteriorly, 

 the regions faintly indicated, the dorsal surface without ridges or 

 wrinkles, the lateral borders well arched and irregularly dentate. 



Front about half the width of the anterior border, or about a third 

 the greatest breadth of the carapace, strongly deflexed, its free edge 

 nearly straight. 



Orbits small, shallow, the lower border is wanting except for the 

 tooth at the inner angle. The antennules fold nearly transversely in 

 fossae which are widely open externally : interantennular septum very 

 broad. Antennal flagella slender and very short, standing in the 

 orbital hiatus. 



Epistome of moderate length fore and aft. External maxillipeds 

 having a rhomboidal gap between them, in which the mandibles are 

 visible : the merus is narrower than, but about the same length as, the 

 ischium, and is a little oblique : the palp, which though coarse is small, 

 articulates at the an tero- external angle of the merus. 



Chelipeds in both sexes subequal : in the male they are very much 

 more massive than the legs and longer than the first and last pairs : in 

 the female they are relatively shorter and much less massive than in 

 the male. The tips of the fingers are acute. 



Legs stout, their joints are not particularly broad or compressed 

 but have their edges armed with stout bristles : the dactyli are long, 

 acute, and thorny. The 2nd and 3rd pair of legs are the longest, and 

 between their bases is a recess fringed with hairs resembling that found 

 in Ocypoda and Gelasimus, and probably indicating terrestrial or 

 amphibious habits. 



The abdomen in both sexes consists of seven segments, and in the 

 male its base covers all the breadth of the sternum between the last 

 pair of legs. 



Distribution : Islands of East Indian Archipelago. 



