376 ' CRUSTACEA. 



P. Depiirator 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. 3Icenas being the common one 

 found alice 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. Juty 2'3rd, 1851. — A perfect P. 

 lividus was the only crab I found on the beach, in addition to the above 

 two specimens. 



P. corriigatus, 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. eornigatus as inhabiting the harbour of Cove, but 

 those so named in his collection are the wrinkled variety of P. Dejiurator. 



Dredged in 20 fathoms, Belfast Bay, Mr. Hyndman. 



P. 2^usiMus, 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. V. 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, Triyla 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 oiu- 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 



