416 CIRRIPKDA. 



II. SESSILIA. 



Genus Balanus. 

 B. cusfafus, Moiit. 



North, East, and South of Ireland. Cork Harbour, on Pinna, from 

 deep water, Mr. Humphreys. 



B. Commimis, Mont. 



Coast of Down, Mr. Hyndman. Dublin coast, W. T. Common on 

 coast of Cork, on rocks, Mr. Humphreys. 



B. tuitiminbiilum, Linn. 



On drifted wood at Howth, Br. Turt. Cat. In Dublin Bay it has been 

 found affixed to the Osfrea operciilaris, from which circumstance it is 

 clearly identified as a British production, Turt. Con. Die. 75. Bottoms 

 of ships in Cork Harbour, Mi-. Humphreys. 



B. ovularls, Lam. 



In IlaUchondna celata, dredged with oysters in Belfast and Strangford 

 Loughs, W. T. 



Pigeon House, Killinchy and Killough, Br. Turt. Cat. 

 Cork Harbour, Mr. Humphreys. 

 Youghal, Dr. Ball. 



B. ruffoms, Mont. 

 Down coast, Mr. Hyndman. 

 " Dublin Bay and Portmarnock, common," Turt. Cat. and C. D. 



B. Scoticus, Brown's Illus., pi. 7, f. 22. 



This species or variety is found on Pecten maximns in the North, and 

 on the Dublin coast by Dr. Farran, who remarks that he has obtained it 

 only on this shell. Dredged off Belfast Bay, Mr. Hyndman. 



B. candidus, Leach. 



Two specimens in Mr. Hyndman's collection attached to Modiola vulgaris, 

 taken in Belfast Bay by a Carrickfergus fishennan. 



Specimens of this fine Balnmis, taken off the northern coast of Dublin, 

 or between Carlingford and the Isle of Man, are in the collections of Mr. 

 Warren, Dr. Farran, and Dr. Ball, of Dublin. The largest specimen is 

 3 inches in height (not reckoning valves) and nearly as much in diameter. 

 The species varies greatly in form, being sometimes much elongated, and 

 of similar breadth from base to top, but is generally sub-pyramidal. Dr. 

 Farran states that it is always adherent to 3L>dwlus ruhjaris : and is 

 brought ujj in the trawl-nets used in taking flat-fish. 



B. pimctatus, Mont. 



Covering the rocks at Tory Island, G. C. H. 



Found at Carrickfei'gus ; common on the island of Ireland's Eye, Dub- 

 lin coast (W. T.), and at Youghal (Dr. Ball). 



Bangor, Co. Down, July 4th, 1S46, G. C. H. and W. T. 



B. piincfafiis, Mont., is the species (and it only) covering over the entire 

 beach and the base of the rocks at Ballyholme Bay. Looking across the 

 bay it imparts a dull whitish (oaten-cake colour) appearance to the entire 



