318 Carcinological Fauna of India. 



2. The epistome is short, sunken, and not boldly 

 separated from the palate : — 



i. Eyes minute, orbits concealed beneath 

 the anterior border of the carapace : 

 merns of extei-nal maxillipeds with a 



sharp antero-external angle ... . Scalopidu. 



11. Eyes obsolete or nearly so, orbits visible 

 from above : antero-external angle of 

 merus of external maxillipeds ronnded 



off TyPHLOCARCINODI'.S. 



II. The basal joint of the antennules completely fills its 

 fossa, into which the flagellura cannot therefore be 

 retracted : — 



1. Eyes small, but perfect : onter border of mcrus 



of external maxillipeds almost straight Hephthopelta. 



2. Eyes reduced to a speck of pigment : outer 

 border of merns of external maxillipeds with a 



strongly convex bulge outwards Camatopsis. 



B. Only three pairs of legs besides the chelipeds, the last 

 pair of other crabs not being represented even by a rudi- 

 ment. The vasa efferentia of the mtile open on the 4th 

 stevaa\ segment {Hexapodinre) Lambdophatj.us. 



Subfamily iii. Rhizopinj;, Stiinps. 



NoTONTX, A. M. Edw. 



Noto7iyx, A. Milne Edwards, Noiiv. Archiv. du Mns. IX. 1873, p. 268 : Miers, 

 Challenger Brachyura, p. 235. 



Carapace deepish, subquadrilateral with the antero -lateral angles 

 rounded off, broader than long, perfectly nude smooth and polished, 

 without any indication of regions, convex fore and aft and anteriorly 

 declivous. 



Fronto-orbital border a good deal more than three-fourths the 

 greatest breadth of the carapace : antero-lateral borders short, entire, 

 curved. Fi'ont straight, sublarainar, from two-fifths to half the breadth 

 of the carapace. 



Byes small but well developed, the eyestalks movable, obpiriform : 

 orbits in the usual maigiual position. The antennules fold transversely 

 ill well formed pits. Basal antenna-joint short; the flagellum, which is 

 of fair length, stands in the orbital hiatus. 



Epistome well formed, nearly vertical : buccal cavern a little wider 

 in front than behind. A slight hiatus between the external maxillipeds, 

 the merus of which appendages is square and carries the flagellum at 

 the antero-internal angle. 



Chelipeds subequal, or a little unequal, smooth and polished, much 



660 



