50 HISTORY OF BRITISH CRUSTACEA. 



very much shorter than the third pair. Carapace with the 

 latero-anterior margins short. 



Cornwall (Mr. Cocks) j off Falmouth in deep water (Rev. 

 A. Norman) j Oxwich Bay near Sandwich, and Mount's 

 Bay (Mr. Bate)* 



Portunus plicatus, Risso. — Front with three strong 

 triangular teeth ; carapace with the surface unequal, some- 

 what granular, and covered with hairs, considerably nar- 

 rowed behind. 



A common species on many parts of our coasts as far 

 north as the Moray Firth. This species and the next are 

 called in Cornwall, Harbour or Mary Crabs ; they are very 

 ravenous, and fasten eagerly on any animal substance that 

 comes within their reach. (Couch, ' Cornish Fauna/ p. 72.) 



Portunus marmoreus, Leach. Marbled Fin Crab. — 

 Front with three small blunt teeth ; carapace very slightly 

 granulated, without hair, symmetrically marked with buff 

 and brownish-red. Hind legs with the tarsus pointed at 

 the ends. 



Not uncommon on our coast. Mr. Bell remarks that 

 " the colours of this species are exceedingly varied and 



* This has been described by Mr. Spence Bate as the Portunus Dalyelli. 

 Ann. Nat. Hist. 2nd ser. vii. 321. 



