50 
HISTORY OF BRITISH CRUSTACEA. 
very much shorter than the third pair. Carapace with the 
latero-anterior margins short. 
Cornwall (Mr. Cocks) ; off Falmouth in deep water (Rev. 
A. Norman) ; Oxwich Bay near Sandwich, and Mount's 
Bay (Mr. Bate). - * 
Portunus plicatus, Risso. — Pront 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 Pirth. 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 Pauna/ p. 72.) 
Portunus marmoreus, Leach. Marbled Fin Grab . — 
Pront 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 JDalyelli. 
Ann. Nat. Hist. 2nd ser. vii. 32L 
