210 A. Alcock — Garcinolonical Fauna of India. [No. 1 



Anterolateral borders very much shorter thnn the postero-lateral, 

 cut into four lobes or teeth, of which the first is confluent with the 

 outer angle of the orbit : postero-lateral border moderately convergent, 

 posterior border rather long. 



Front broadish, nearly a third the greatest breadth of the carapace, 

 obliquely deflexed, projecting a little beyond the orbits, straight and 

 square cut, commonly emarginate in the middle line. 



Orbits shallow, affording little concealment to the eyes, the upper 

 margin entire, a gap in the lower margin, below the outer angle. The 

 antennules fold quite transversely. 



Basal antennal joint short, not reaching the front, the flagellum, 

 which is long (much longer than the major diameter of the orbit), 

 lodged in the orbital hiatus. 



The ridges of the endostome, denning the expiratory canals, are 

 well pronounced, but the anterior border of the merus of the external 

 maxillipeds is not notched. Buccal cavern wider anteriorly than 

 posteriorly. 



Chelipeds unequal in both sexes, fingers pointed, not hollowed. 



The abdomen of the male is seven-jointed. 



Eurycarcinus is very closely related to Heteropanope, but is easily 

 distinguished by the broad smooth convex carapace, the shallow and 

 rather elongate orbits, and the very short antero-lateral margins. 



Key to the Indian species of Eurycarcinus. 



I, Thumb of the larger cheliped with a much-enlarged tooth 

 at basal end : — 



1. Antero-lateral border less than f the length of the 

 postero-lateral E. orientalis. 



2. Antero-lateral border at least § the length of the 

 postero-lateral E. maculatus. 



II. Thumb of the larger cheliped without a much-enlarged 



tooth at base E. grandidieri. 



134. Eurycarcinus orientalis, A. Milne Edwards. 



Eurycarcinus orientalis, A. Milne Edwards, Ann. Soc. Entom. France (4) VII. 

 1867, p. 277 : de Man, Notes Ley den Mus. XIV. 1892, p. 226. 



Carapace rather over two-thirds as long as broad, perfectly smooth 

 (except for an extremely fine and faint granular ridge that runs 

 transversely inwards towards the gastric region from the last tooth of 

 the antero-lateral margin), decidedly convex fore and aft and slightly 

 so from side to side. 



Front cut quite straight and square, slightly emarginate in the 

 middle line. 



