MARBLED SWIMMING-CRAB. 



105 



DECAPOD A. 

 BRACHYURA. 



PORTUNIDM. 



MARBLED SWIMMING-ORAB. 



Portunus marmoreus. Leach. 



Specific cliaracter. — Carapace even, very slightly granulated, without hairs ; 

 latero-anterior margin armed with five teeth on each side ; front three-toothed, 

 the teeth rather obtuse, the middle one the longest ; hands with four carinae, 

 slightly denticulate ; terminal joint of the posterior feet without raised lines, 

 the apex mucronate. 



Portunus marmoreus. 



Leach, Malac. Brit. t. viii. 

 442. 



Edw. Hist. Crust. I. p. 



The general form and the whole of the characters of 

 this elegant species resemble so exceedingly that of P. 

 liolsafus, that I am almost imperatively forced to con- 

 sider them as varieties of one species The carapace is 

 somewhat convex, with the regions moderately distinct ; the 



