200 



Carcinological Fauna of India, 



anterior border cut into four or five teeth, of which the first, or external i 

 orbital angle, is small and pointed, the second larger et a extremite 

 mousse, and the others successively smaller. The rostrum consists of 

 two short stout spines, and the supra-ocular border forms a spine. 

 Chelipeds short : fingers evenly toothed. Ambulatory legs ending in a 

 recurved claw. The abdomen of the male consists of 5 segments, the 

 2nd, 3rd and 4th being fused together. 



There are no specimens of this species in the Museum Collection, 

 which is included in this Fauna on the authority of Dr. Heller who 

 mentions it in the * Novara ' Collection, from Madras. 



The genus or sub-genus Scyramathia has, I think, very close affinities 

 with the genus Pugettia, and is certainly, I think, a close link between 

 this sub-family and the following. 



Sub-family iii. PISIN^E. 



Eyes with commencing orbits, of which one of the most character- 

 istic parts is a large, blunt, usually isolated and cupped post-ocular 

 tooth or lobe, into which the eye is retractile, but never to such an 

 extent as to completely conceal the cornea from dorsal view : there is 

 also almost always a prominent supra-ocular eave, the anterior angle 

 of which is sometimes produced forwards as a spine. Eye-stalks short. 

 Basal antennal joint broad, at any rate at the base ; its anterior angle 

 generally produced to form a tooth or spine. Merus of the external 

 maxillipeds, owing to the expansion of its antero-external angle, broader 

 than the ischium, and carrying the palp at its antero-internal angle, 

 Rostrum two-spined (in Doclea obscurely so). Legs often very lono\ 



Key to the Indian Genera. 



Alliance 1. Pisoida. Supra-ocular eave not in close contact with the post- 

 ocular spine or process, and generally produced, but not very conspicuously, at the 

 antero-external angle in the plane of the rostrum. 



1. Post-ocular tooth either not cupped, or 

 if cupped then the carapace is armed 

 with long acute spines of uniformly- 

 large size and regular arrangement Scyramathia. 



I. Spines of the ros- 

 trum separate 

 from the base, ^ 

 usually long and 

 divergent. 



. Post-ocular tooth 

 deeply cupped ; 

 spines of the ca- 

 rapace, if present, *j 

 never of uniform 

 size and arrange- 

 ment. 



\i. Spines of the ros- 



Itrum bearing a 

 secondary spinule, 

 either at tip or 

 somewhere in their 

 distal half Naxia. 



ii. Spines of the ros- 

 trum without a 

 ^. secondary spinule 



Hyastenus. 



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