1899.] A. Alcock — Carcinological Fauna of India. 



The family is hero divided into 6 sub-families : — 



family I. 



CancrindQ 



see ahead 



p. 95. 



11. 



Pirimelinse 





p. 95. 



m. 



Thiinse 





p. 96. 



IV. 



Atelecyclinas 





p. 96. 



V. 



Acanthocyclinse 





p. 96. 



Subfamily VI. 



TricMinse 





p. 96.] 



[? 



In the Virimilinse and Thiinse this family approaches the Garcininso 

 among the Portunidae; and by the AtelecycUnae it is allied to the 

 Corystidas, 



Family V. Cortstidj:. Carapace a good deal longer than broad, 

 elongate-oval, the regions fairly well defined or not, not areolated. Front 

 rather prominent, not very broad, cut into 2 or 3 teeth. 



The antennules are small and fold longitudinally. 



The antennal flagella, when present, are long — sometimes longer 

 than the carapace — coarse, and setaceous. 



There is no epistome, and the maxillipeds, which occasionally have 

 a pediform cast, are elongate and extend almost up to the antennules. 



Buccal cavern rather elongate, its sides slightly convergent quite 

 at their anterior end. 



Legs either gressorial, or the last pair modified for swimming. 



Sternum narrow and elongate. 



In some of the genera of this group the antennal flagella are as 

 long as the carapace and the dactyli of the legs are almost styliform : 

 in others the dactyli are lanceolate — the last pair broadly so — and the 

 antennal flagella are not more than half as long as the carapace. 



The Corystidse are the lowest Cyclometopa and have much the same 

 relative position to the higher families of Cyclometopes as the 

 Raninidse have to the higher families of Oxystomes. 



Family PORTUNID^. 



Portuniens, Milne Edwards, Hist. Nat. Crust. I. 432: A. Milne Edwards, 

 Ann. Sci. Nat., ZooL, (4) XIV. 1860, p. 195; and Archiv. du Mns. X. 1861, p. 310. 



Portunidge and Platyonychidse, Dana, U. S. Expl. Exp. Crust, pt. I. pp. 267, 

 290. 



Portunidse, Miers, Challenger Brachyura, p. 169. 



Portuninea, Ortmann, Zool. Jahrb., Syst., VII. 1893, p. 65. 



Carapace depressed, or little convex (strongly convex in SpJiserocar- 

 cinus), hexagonal, sometimes subquadrate, occasionally elongate-obovate 

 or even subcircular, but generally broader (typically much broader) 

 than long ; the regions most often not well defined, seldom areolated ; 



