180 • A. Alcock — Carcinological Fauna of India. [No. 2, 



chelipeds, in the adult male, more 

 than twice the length of the carapace N. hardioickii. 

 II. No trace of an oblique ridge on the hepatic 

 regions or of a transverse ridge behind the 

 branchial regions, the longitudinal and epi- 

 branchial ridges alone present : posterior 

 margin not manifestly bilobed : npper surface 

 of hand traversed from base to finger-cleft by 

 a distinct ridge : — 



1. Carapace convex : front broadly bi- 



dentate N. persica. 



2. Carapace almost laminar : front broadly 



pointed JSf. abbreviata. 



III. No ridges at all on the carapace : margins not 



manifestly sinuous N. rubifera. 



22. Nursia plicata, (Herbst) nee auctorum. 

 Cancer plicatus, Herbst, Krabben III. iv. 2, pi. lix. fig. 2. 



Carapace about three-quarters as long as broad, with the posterior 

 margin in the form of two semi-circular dorsally-conc'ave lobes. The folia- 

 ceous lateral margins are scallopped, each into four blunt teeth : in front 

 of the first of these (which is rounded off), on either side, is a thickened 

 marginal nodule ; and the last, on either side, are united by a coarse 

 granular ridge running across the carapace parallel with the posterior 

 margin, which it cuts off from the rest of the carapace. This ridge 

 culminates, in the middle line, in a coarse granular tubercle. 



The middle of the carapace forms a coarsely-granular eminence 

 surmounted by 3 tubercles in a triangle. From it six blunt coarsely- 

 granular ridges radiate, as follows : — one forwards, in the middle line, 

 to the front ; one backwards, in the middle line, to the transverse ridge ; 

 one obliquely forwards, across the hepatic region on either side, to the 

 nodule on the hepatic margin ; and one obliquely backwards to the 

 penultimate lateral tooth on either side. The spaces between the ridges 

 are markedly concave, and are usually smooth. 



The front hardly projects beyond the eyes, and has a coarse thick- 

 ened granular edge : it is usually obscurely bilobed, and never 

 quadridentate. 



The surfaces of the external maxillipeds, of the pterygostomian 

 regions, of the thoracic sterna, and of the proximal part of the male 

 abdomen are distinctly granular. 



The chelipeds in the adult male are If times, in the adult female about 

 lj times the length of the carapace : the arm has only its outer border 



