1899.] A. Alcock — Carcinological Fauna of India. 75 



i. All the frontal teeth clearly cut 

 and on the same level, the middle 

 pair much narrower than the sub- 

 median pair T. investigatoris. 



ii. The middle frontal teeth are not 

 very clearly defined from, are on a 

 lower plane and are not much 

 narrower than, and are somewhat 

 overlapped by the subraedian pair T. imparimanus. 

 2. Antero-lateral borders cut into five 

 teeth, of which the last two are much 

 smaller than the others : all the frontal 

 teeth clearly cut, the median on a lower 

 plane and hardly narrower than the sub- 

 median pair T. exetastica. 



B. Front cut into four lobes— exclusive of the inner 

 supra-orbital angles : — 



1. Median lobes of the front narrower than 

 the lateral lobes : — 



i. Front sinuous, the median lobes 

 more prominent than the others : — 



a. Median frontal lobes mode- 

 rately prominent : antero-lat- 

 eral borders of carapace cut 

 into five teeth, of which the 



4th is the smallest T. sexlobata. 



b. Median frontal lobes conspi- 

 cuously prominent : antero- 

 lateral borders cut into four 

 teeth, of which the 3rd is the 



smallest T. hanseni, 



ii. Front perfectly straight : antero- 

 lateral borders cut into five teeth 

 of which the 4th is the smallest ... T. intermedia. 



2. Median lobes of the front very much 

 broader than the lateral lobes : — 



i. Wrist with 3 sharp spinules on the 

 outer surface, hand with granular 

 costsB on outer surface, fingers 

 about as long as the palm T, wood-masoni, 



ii. Outer surface of wrist and hand 

 nearly smooth, fingers shorter than 

 palm T. taproltanica, 



C. Front cut into two lobes — exclusive of he inner 

 supra-orbital angles : — 



1. Front very slightly convex, hardly pro- 

 minent beyond the supra-orbital angles : 

 carapace markedly transverse, its antero- 

 lateral borders cut into five teeth of 



