376 
CRUSTACEA, 
P. Depurator in Mr. J. V. Thompson’s collection (now in the College of 
Surgeons, Dublin) being in reality P. lividus, it might be supposed that 
the species is not common. We have however dredged it in Strang- 
ford Lough, in the open sea off Down, and on the Connaught coast. 
During some weeks spent at Bangor, near the entrance of Belfast Bay, in 
the autumn of 1835, I found this to be the most common species of crab 
thrown by the waves upon the beach — Care. Mcenas being the common one 
found alive between tide-marks. Dr. Ball mentions that the P. Depurator 
is local, but abundant where it does occur about Youghal. 
Recently taken at Dublin. — R. P., 1854, 
P. lividus, Leach, 
Is not common. Templeton mentions it as found by him “ on the 
shore at Dunfanaghy.” We have dredged it on more than one occasion 
in Belfast Bay, and have obtained it on the beach at Carnlough, County 
of Antrim. In Dr. Ball’s collection are several specimens which were 
dredged in Dublin Bay. Leach mentions his having seen but two ex- 
amples of this species. 
Newcastle , Co. Down, July, 1851 . — Portunus lividus, one imperfect, but 
sufficiently perfect for positive identification on comparison with Bell’s 
Crustacea, found in a fishing-boat. July 23rd, 1851. — A perfect P. 
lividus was the only crab I found on the beach, in addition to the above 
two specimens. 
P. corrugatus, Leach. 
The only specimens of this species which I have seen are some fine ex- 
amples from Larne and Carrickfergus in the Ordnance collection, and a 
single specimen obtained on the Dublin coast by Dr. Ball. Mr. J. V. 
Thompson notices P. corrugatus as inhabiting the harbour of Cove, but 
those so named in his collection are the wrinkled variety of P. Depurator. 
Dredged in 20 fathoms, Belfast Bay, Mr. Hyndman. 
P. pusillus, Leach, 
Generally inhabits deep water. It is ordinarily taken by us when 
dredging in the Loughs of Strangford and Belfast ; at the Killeries in 
Connemara it has similarly occurred, as well as in Dublin Bay. In the 
South, too, it has been taken by Mr. J. Y. Thompson in the harbour of 
Cove — see note on P. marmoreus, p. 282. I have several times found it 
in the stomachs of fishes; in one instance in a \Trigla Gurnardus , taken 
in the open sea off Down. 
At Compton, in the Isle of Wight, I procured several of this species 
thrown by the waves upon the beach. 
P. arcuatus, Leach, 
Has been taken occasionally by us when dredging in deep water in the 
Loughs of Strangford and Belfast ; and has been found cast ashore at 
Portmarnock by Dr. Ball. It was procured by our party in the summer 
of 1840, when dredging in Killery and Roundstone Bays on the western 
coast. Specimens are in Mr. J. V. Thompson’s collection, and, it may be 
presumed, from Cork. All the examples of this species which have oc- 
curred to myself were taken in the dredge, excepting on one occasion 
(Oct. 1) at Killinchy, on the shore of Strangford Lough, when, looking to 
the refuse in a number of small boats which had been employed the night 
