Carcinologloal Fauna of India 245 



Sehizophrys dama, (Herbst.) 



Cancer dama, Herbst, Krabben, III. iv. p. 5, tab. lis. fig. 5. 



Mithrax dama, Milne-Edwards, Hist. Nat Crust., I. 319. 



Mithrax (Sehizophrys) dama, Kossniann, Reise Roth. Meer., Crust., pp. 11 and 13. 



This species differs constantly from Sehizophrys aspera in the follow- 

 ing particulars : — 



(1) the carapace is much, more elongate, its greatest breadth 



being only about f its length behind the point of bifurca- 

 tion of the rostral spines ; 



(2) the rostrum is rather longer, and lias two accessory spines 



on its outer border ; 



(3) there is no (ventral) spine on the sub-hepatic region ; 



(4) the surface of the carapace is more closely and evenly, but 



more bluntly, granular. 

 The specimens in the Museum collection come from the Straits of 

 Malacca. 



Cyclax, Dana. 



Cyclax, Dana, U. S. Expl. Exp., Crust., pt. I. p. 99. 



Cyclomaia, Stimpson, Atner. Journ. Sci. and Arts, Vol. XXIX. 1860, p. 133; 

 and A. Milne-Edwards, Nouv. Archiv. du Mus., VIII. 1872, p. 235 (et synon.) 



Cyclax (Cyclax and Cyclomaia), Miers, Journ. Linn. Soc, Zool., Vol. XIV. 1879, 

 p. 6G0. 



This genus differs from Sehizophrys, from which, perhaps, it ouo-lit 

 not to be separated, only in the form of the carapace, and in the de- 

 gradation and shortening of the rostrum, with which is correlated 

 a shortening and broadening of the basal anfcennal joint. (In one 

 species the legs are slender). The carapace is subcircular ; the rostrum 

 obsolescent and bifid ; the basal antennal joint very short and broad, and 

 armed with a third spine — a very small one, situated on the outer 

 margin. 



Cyclax (Cyclomaia) suborbicularis, (Stimpson). 



Mithrax suborbicularis, Stimpson, Proc. Ac. Nat. Sci., Philad., 1857, p. 218. 



Cyclax spinicinctus, Heller, Crust. Roth. Meer, in SB. Ak., Wien, XLIII. i. 1861, 

 p. 304, tab. i. figs. 7-8 : and Richters, in Mobius, Meeresfauna Maurit., p 144. 



Cyclomaia margaritata, A. Milne-Edwards, Nouv. Archiv. du Mus., VIII. 1872, 

 p. 236, pi. x. figs. 2-3; and Haswell, P. L. S., N. S. Wales, Vol. IV. 1879, |p. 441, 

 and Cat. Austral. Crust., p. 21. 



Cyclomaia suborbiciduris, Ortmann. Zool. Jahrb., Syst., etc., VII. 1893, p. 58. 



\_Cyclomaia margaritata, F. Muller, Verh. Ges., Basel, VIII. p. 473.] 



Carapace subcircular, its surface closely beaded, with some larger 

 spinules regularly interspersed : the lateral margin is armed with six 

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