52 
HISTORY OF BRITISH CRUSTACEA. 
Moray Firth and the Firth of Forth it is very common, and 
also in the Firth of Clyde (Rev. A. Norman). 
Portunus arcuatus, Leach.— Front of carapace entire, 
or very slightly two-lobed ; second pair of legs shorter than 
the first pair, and nearly as long as the third pair. Cara- 
pace granular, the penultimate lateral tooth much smaller 
than the others. 
Generally distributed on the coast. Mr. Bell says that 
its habits are very similar to those of the other species of 
the genus • “ they are active, bold, swimming with agility, 
and seizing with great sharpness and pinching severely with 
their acute claws. They are gregarious, like most of their 
congeners ; and I found them extremely abundant at Bog- 
nor, where they constantly infest the prawn-pots, and, as 
the fishermen believe, keep the prawns from the bait.”* 
The Rev. Alfred Norman remarks that this species is abun- 
dant in Falmouth harbour, in four fathoms ; he finds it in 
the Firth of Clyde, in the coralline zone. 
Tribe 3. CATOMETOPITA, M. Edw. 
Carapace generally quadrilateral or ovate, with the front 
nearly straight. Eyes often on long pedicels. 
* British Crustacea, p. 99. 
