318 A. Alcock — Carcinologicnl Fauna of India. [No. 3, 



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

 separated from the palate : — ■ 



i. Eyes minate, orbits concealed beneath 

 the anterior border of the carapace : 

 merus of external maxillipeds with a 



sharp autero-external angle Scalopidia. 



ii. Eyes obsolete or nearly so, orbits visible 

 from above : antero-external angle of 

 merus of external maxillipeds rounded 



off Typhlocarcinodes. 



II. The basal joint of the antennules completely fills its 

 fossa, into which the flagellum cannot thereforo be 

 retracted : — 



1. Eyes small, but perfect : outer border of merna 



of external maxillipeds almost straight Hephthopelta. 



2. Eyes reduced to a speck of pigment : outer 

 border of merus 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 efferentta of the male open on the 4th 

 sternal segment (Hexapodintt) Lambdophallus. 



Subfamily iii. Rhizopin^:, Stimps. 



Notonyx, A. M. Edw. 



Notonyx, A. Milne Edwards, Nouv. Archiv. du Mus. IX. 1873, p. 268 : Miers, 

 Challenger Brachyura, p. 235. 



Carapace deepish, subquadrilafceral 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. Front straight, sublaminar, from two-fifths to half the breadth 

 of the carapace. 



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

 orbits in the usual marginal position. The antennules fold transversely 

 in 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 



