660 Proceedings of the Royal Irish Academy. 



TJiracia papyracea (Poll). 

 i., ii., iii., iv., v., vi. 



Generally distributed round the coast on sandy shores in the lami- 

 narianzore; also var. 2J2.7/osm.sc?</«, Macgillivray, which usually frequents 

 deeper water. 



Yar. gracilis, Jeffreys. Bantry Bay (Jeffreys, '65). 



Distribution. — Iceland. Loffoden I. to Mediterranean. Morocco. 

 Madeira. Canaries. Florida to W. Indies (Dall). 



Thracia puhescens (Pulteney). 



i., ii., iii., . v., . 



i. Belfast Lough (Thompson, '56) : Turbot Bank, dead, scarce 



(Hyndman, '58). 

 ii. JS^ear Dublin (Warren, f. Tliompson, ''oQ>). 

 iii. Cork Harbour (Humphreys, '45 ; Wright & Carroll, '52). 

 V. Birterbuy Bay (living, Walpole, '52 ; Barlee, f. Porbes & Hanley, 

 '53 ; a specimen in Warren Coll. in Dublin Mus.). 

 "The reputed Irish localities are doubtful: this species has 

 been often mistaken for the adult of T. papyracea : the only specimen 

 in Mr. J. D. Humphreys's extensive collection of shells from Dublin, 

 Cork, and Bantry was marked by him ' England' " (Jeffreys, '65). 



Bistrihution. — British Isles. Prance. IMediterraneau. Morocco. 

 Madeira. Canaries. 



Thracia convexa (AV. AVood). 



i., ii., iii., iv., v., . 



i. Lough Poyle, single valves (Rev. J. D. Palkiner, f . Prseger) : off 

 Black Head, two broken specimens, but with ligament fresh 

 (Hyndman, '58): Strangford Lough (Thompson, '56; 4-25 fms., 

 dead, Dickie, '58). 

 ii. Off Skerries (Walpole, '52) : off Dublin coast, three full-grown 

 specimens with animal in a fresh state (Warren, f. Thompson, 

 '56) : Portmarnock, single valve (Kinahan, '60) : Dublin Bay 

 (Turton, '19 ; Warren Coll. in Dublin Mus.). 

 iii. Cork Harbour, rare (Humphreys, '45). 

 iv. Bantry Bay (M'Andrew, f. Thompson, '56). 

 V. Birterbuy Bay, dead (Walpole, '52) : Eoundstone, valve (Alcock, 

 '65). 

 Bistrihution. — Norway to Mediterranean. Sitka. 



