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



Key to the Indian genera of Raninidse. 



I. Last pair of legs of normal size : antennas with 

 a very stout peduncle that hides the antennules : 

 antennary flagellum long and stiff : — 



1. A well-developed rostral spine Notopus. 



2. A V-shaped excision in the carapace in place 



of a rostrum Cosmonotus. 



II. Last pair of legs abnormally small and slender 

 — almost filiform : antennary peduncle not com- 

 pletely hiding the antennules : antennary flagellum 

 small : — 



1. Fronto-orbital border more than half the width 

 of the carapace : sternum broad as far as the 

 third pereiopods : merus of the external maxilli- 



peds shorter than the ischium Raninoides. 



2. Fronto-arbital border less than half the width 

 of the carapace : stern am broad only as far as 

 the second pereiopods : merus of the external 

 maxillipeds a little longer than the ischium Lyreidus. 



Notopus, DeHaan. 



Notopus, DeHaan, Faun. Japon. Crust, pp. 137, 138. 

 Notopus, Henderson, ' Challenger ' Anomura, p. 31. 



Carapace obovate or obconical in outline, strongly convex from 

 side to side, nearly smooth : regions undefined. Fronto-orbital border 

 more than half the breadth of the carapace. Eyes distinct, eyestalks 

 long slender and cylindrical, orbits oblique. 



Antennules much smaller than the antenna?. Antennae with a long 

 very stout peduncle and long stout flagellum, the peduncle concealing 

 the antennulary peduncle. Merus of the external maxillipeds a little 

 shorter than the ischium, and having its inner border thickened and 

 raised. Sternum broad between the chelipeds and then suddenly be- 

 coming very narrow. Last pair of legs of normal size, arising a little 

 in advance of the penultimate pair. 



The abdomen in both sexes has all 7 terga separate. 



108. Notopus dorsipes, (Fabr.) DeHaan. 



Pedieulus marinus, Eumph, Amboin. Rariteitk. I. 29, pi. x. fig. 3. 

 Hippa dorsipes, Fabricius, Ent. Syst. II. 475. 

 Albunea dorsipes, Fabricius, Ent. Syst. Suppl. p. 397. 



Banina dorsipes, Latreille, Hist. Nat. Crust, et Ins. VI. 133, [and EncycL 

 Method. X. 268, pi. 287, fig. 2] : Milne Edwards, Hist. Nat. Crust. II. 195. 



