Carcinologicul Fauna of India. 213 



its extent by granules visible to tbe naked eye : a definite 

 patcb of encrusting spongy pubescence at the basal end 

 of the upper surface of the arm : meropodites of legs 

 compressed : abdomen of the male consisting of 3 pieces, 

 of the female of 4 pieces : — 



1. Front much broader than long, distinctly trigonal, 

 its sides merging in the antero-lateral borders of the 

 carapace without any very abrupt transition : thoracic 

 sinus deep, the edge of the pterygostomian region, 

 which forms the anterior boundary of the sinus, convex 

 and granular or milled : surface below the posterior 

 margin of the dorsum of the carapace sharply granu- 

 lar : — 



i. Outer limb of the thoracic sinus not invading the 



antero-lateral margin of the carapace L. craniolaris. 



ii. Outer limb of the thoracic sinus invading, and 

 causing a marked emargination of, the antero-lateral 

 border of the carapace L. viftafa. • 



2. Front about as long as broad, with the sides sub- 

 parallel or, at any rate, forming an abrupt junction with 

 the antero-lateral borders of the carapace : thoracic 

 sinus shallow, the edge of the pterygostomian region, 

 which forms the anterior boundary of the sinus, not 

 strongly convex and not granular or milled : — 



i. The edge of the pterygostomian region that bounds 

 the thoracic sinus almost straight : surface of cara- 

 pace below the posterior margin of dorsum granular : 

 inner surface of hand with two prominent sharp-cut 



rows of granules : size about 14 millim L. rhomboidulis. 



ii. Edge of the pterygostomian region a little convex : 

 surface of carapace below posterior margin smooth : 

 inner surface of hand smooth, or with a single row 

 of obsolescent granules : size about 18 millim L. pubescens. 



III. Carapace as broad as long, urn -shaped or broadly 



hexagonal, often with a strip of thick far along the 



postero-lateral border, the thickened epimeral edge visi- 

 ble, dorsally, in all its extent when the carapace is held 



without any inclination straight in front of the observer's 



eyes : front obtuse : the thoracic sinus with or without 



granules : either a definite patch of spongy pubescence 



or a good deal of coarse hair at the basal end of the 



upper surface of the arm : meropodites of legs com- 

 pressed : [abdomen of male consisting of 4 pieces, that 



of the female of 3, or if of 4, then the 3rd piece is again 



incompletely subdivided] : size very small, rarely 14 



millim. : — 



1. Lateral epibranchial angle and true postero-lateral 

 border of the carapace with a sharply defined edging 

 of thick fur : — 



218 



