1900.] A. Alcock — Careinological Fauna of India. 411 



Key to the Indian species of Sesarmn. 



I. Carapace deepish, its length decidedly less than its breadth 

 between the anterolateral angles, its sides nearly parallel — 

 never markedly divergent posteriorly : — 



1. The inner border of the arm bears, near its far end, 

 a large acute tooth : on the upper surface of the 

 palm of the male are at least two characteristic 

 oblique comb-like ridges : the upper surface of the 

 movable finger of the male is milled : — 



i. Posterior border of the meropodites of the 

 legs entire : — 



a. No tooth on the lateral border of the 

 carapace behind the orbital angle : — 



a. Front more than half the extent 

 of the anterior border of the 

 carapace 8. quadratum. 



£. Front exactly half the extent of 

 the anterior border of the 

 carapace g. pictum. 



b. A tooth on the lateral border of the 

 carapace, behind the orbital angle 8. bidens. 



ii. Distal end of the posterior border of the mero- 

 podites of the legs acutely serrate (no tooth 

 behind the outer orbital angle) 8. Andersoni. 



2. The inner border of the arm does not end in a large 

 spine or acute lobe, though it may be a little dilated 

 distally : there are no oblique pectinated ridges on 

 the upper surface of the palm, and the upper surface 

 of the movable finger of the male though it may be 

 granular is not milled : — 



i. A tooth at the inner angle of the wrist (a 

 tooth on the lateral border of the carapace 

 behind the orbital angle) : — 



a. The breadth of the carapace between 

 the antero-lateral angles is equal to, or 

 more than, the breadth between the 

 epibranchial teeth s. Edwardsi. 



b. The breadth of the carapace between 

 the antero-lateral angles is decidedly 

 less than the breadth between the epi- 

 branchial teeth, the sides of the carapace 



being markedly sinuous 8. Meinerti. 



ii. No spine at the inner angle of the wrist : — 



a. Carapace and appendages not uniformly 

 tomentose : two acute teeth— the second 

 of which is hardly visible— on the 

 lateral border, behind the acute orbital 

 an S le 8. intermedium. 



