74 A. Alcock — Carcinological Fauna of India. [No. 1, 



B. Front cut into two lobes — exclusive of the broad 

 inner supra-orbital angles : — 



1. Inner supra-orbital angles arched, much 

 narrower than either of the frontal 

 lobes : — 



i. Frontal lobes distinct and indepen- 

 dent : hand covered with squami- 

 form markings, its outer surface 



costate T.simalT.arcuata?^ 



ii. Median frontal notch indistinct : 

 only the upper part of hand granu- 

 lar, its outer surface smooth or very 

 indistinctly costate :— 



a. Teeth of antero-lateral border 

 of carapace acute, the last 

 more prominent than the 



others T. poissonii [? T. 



sima.'] 

 h. Lobes of antero-lateral border 

 square-cut, the last not en- 

 larged r. chaptali, 



2. Inner supra-orbital angles straight or 

 little arched, not much narrower than 

 either of the frontal lobes : — 



i. Crest of basal antenna-joint smooth : 

 4th tooth of antero-lateral borders 



of carapace rudimentary T. Integra, 



ii. Crest of basal antenna-joint granu- 

 lar, denticulate, or spinose : — 

 o. Crest granular or dentate : 4th 

 tooth of antero-lateral borders 

 rudimentary : fingers rather 



stumpy T. admeta, 



h. Crest granular or dentate : 4th 

 tooth small : fingers sharp 



and as long as the palm T. savignyi, 



c. Crest spinose : 4th tooth some- 

 what smaller than the others : 

 frontal lobes prominent, with 

 their angles though rounded 



strongly pronounced T. quadrilohata, 



II. The extreme extent of the basal antenna-joint is 

 equal to, or less than, the major diameter of the 

 orbit : — 



A. Front cut into six lobes — exclusive of the inner 

 supra-orbital angles :— 



1. Antero-lateral borders of the carapace 

 cut into five teeth, of which the fourth 

 is rudimentary ; — 



