336 MOLLUSCA. 



Family Arcad.^. 



Genus Arc A. 

 A. Nocc, Linn. 

 Fine and perfect specimens of the true Area No(b (according to Mr. 

 Alder) are in Mr. Warren's collection ; they were procured on the coast 

 of Cork by Mr. Townsend. 



Area Noa, Linn. " One specimen taken in Cork Harbour." Cork Fauna, 

 p. 15 (all said of it). 



A.fusea, Mont. 



" A single specimen found on the islands called the Calves, so dangerous 

 of access, in the West of L-eland." Turt. Brit. Biv., under the name A. te- 

 troqona. Magilligan, odd valves, W. T. Portrush in situ — Ordnance col- 

 lectors. From Kenmare, Co. Kerry, imbedded in stone, Mr. Humphreys, 

 in letter, 1809; abundant near Castletown, Co. Cork, Mr. Barlee, attached 

 to valves of shells on a hard sand-bank at entrance of Birterbuy Bay, 

 at a depth of 20 fathoms ; in the fissures of rocks dry at low water in 

 Clifden Bay, Dr. Farran. Burrowed in a stone from deep water off the 

 Copelands, Sep., 1851, Mr. Hyndman.* 



A. raridentata, Searles Wood. 



A living specimen and a valve of this Area were di'edged fi'om 45 

 fathoms off Cape Clear by Mr. M' Andrew. It is a Crag shell. IVIr. M'An- 

 drew procured it alive for the first time off the island of Skye in the sum- 

 mer of 1845. 



A. barbata, Brown. 



" This very perfect and new shell on our coasts was found alive, ad- 

 hering to an oyster from Killinchy in Lough Strangford, by Dr. M'Gee 

 of Belfast," Brown. Never found since. 



Gemis Pectuncultjs. 

 P. pilosiis, Linn. 

 Dublin coast, Br. Turt. More specimens (but all dead) have come under 

 my notice on the sandy beach at Magilligan than elsewhere. 



Dredged very sparingly from about 8 to 10 fathoms (sandy ground) in 

 Strangford Lough, W. T. ; from several fathoms deeper water at en- 

 trance to Belfast Bay, and Glenarm, Mr. Hyndman. " Two specimens, 

 three inches in diameter, were found at Oyster Haven, in 1844," Mr. J. D. 

 Humphreys. 



Gentis NucuLA. 

 N. margaritaeea, Lam. 

 Dublin coast ; plentiful. Brown. Common around the coast, grega- 

 rious ; (h'edged at various depths to 50 fathoms (South Rock, Co. Down, 



* A. lactea, Liim. 



This species is noted with a " ? " in Turton's Catalogue as found on the Calves 

 Islands. In his Conch. Diet., subsequently published, it is made synonymous 

 with A. iierforans. 



In shell-sand, deep water, Belfast Bay, Mr. Hyndman. 



