1896.] 



A. Alcock — Carcinological Fauna of India. 



139 



Subfamily MATUTIN^. 

 Matutidx, Dana, loc. cit., and Miers, loc. cit. 



Merus of external maxillipeds elongate and acute, entirely conceal- 

 ing tlie palp in repose. Legs natatorial. 



I. 



II. 



Key to the Indian genera of Calappidae. 



Calappinse : — Merus of external maxillipeds not elongate or 

 acute, and never concealing tlie flagellum in repose : ambu- 

 l-atory legs gressorial: — 



1. Carapace with a postero-lateral sliield-like 



expansion or series of broad serrations, 

 forming a vault beneath which, the four 

 ambulatory legs can be completely or large- 

 ly conceal-ed in flexion : basal joint of an- 

 tennae much dilated ... ... Calappa, 



2, Carapace without any trace of a postero- 



lateral shield-like expansion: basal joint 

 of antennae slender : — 

 i. Carapace transversely oval, with a large 

 spine at the junction of the antero- 

 lateral and postero-lateral borders ... MuRSiA, 

 ii. Carapace sub-circular or longitudinally 

 suboval, with a small denticle at the 

 junction of the antero-lateral and 

 postero-lateral borders .., 

 Matutinse : — Merus of external maxillipeds elong- 

 ate and acute, and completely concealing the 

 flagellum in repose: ambulatory legs in the 

 form of swimming paddles. (Carapace sub- 

 circular, with a large spine at the junction of 

 the antero-lateral and postero-lateral borders : 

 antennas rudimentary) 



Ca LAPPA, Fabricius, Edw. 



Cryptosoma, 



Matdta, 



CaXappa, Fabricius, Ent. Syst., Suppl. p. 345. 

 Calappa, Milne-Edwards, Hist. Nat. Crust. II. 102. 



Calappa, Lophos, Camara, Gallus, De Haan, Faana Japonica, Crust, pp. 69, 

 70, 125. 



Calappa, Miers, ' Challenger ' Brachyura, p. 283. 



Carapace strongly convex, rounded in front, much broadened behind 

 by a pair of clypeiform expansions, or wings, beneath which the four 

 pairs of ambulatory legs are concealed in flexion. 



