264 Carcinnlogical Fauna of India. 



ii. Median lateral epibranchial 

 spines claw-like, not longer 

 than the spines on the poster- 

 ior part of the carapace, their 

 length being not a quarter the 

 breadth of the carapace : — 



a. Nine spines on margins 

 of carapace, — 3 large 

 and 6 smaller: regions of 



carapace very ill-defined A. novemspinosa. 



b. Eleven spines on mar- 

 gins of carapace, — none 

 of them very large : re- 

 gions of carapace well 



defined A. undecimspinosa. 



2. Fingers shorter than the hand : sur- 

 face of carapace covered with spines, 

 or with granules and larger 

 tubercles : — 



i. Carapace longer than broad : 

 chelipeds less than twice the 

 length of the carapace : — 



a. Carapace densely spiny : 

 eleven large marginal 



spines A. erinaceus. 



b. Carapace with granules 

 and claviform tubercles : 

 eleven marginal promi- 

 nences, of which only 4 



or 5 can be called spines A. tuberculata. 



ii. Carapace broader than long : 



chelipeds a little over twice 



the length of the carapace : 



carapace with granules and 



large tubercles A. pulcherrima. 



(=A. septemspinosa, 

 Bell.) 



II. Margins of carapace with large tubercles 

 in place of spines, hepatic regions dorsally 

 sunken and flat : abdomen of adult male 

 consisting of 4 pieces, and the second piece 



sunk almost out of sight A. gracilipes. 



269 



