520 Proceedings of the Royal Irish Academy. 



Somalogyra rota (Forbes & Hanley). 

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



i. Off Ballycastle, Hying (Chaster, '97a). 

 ii. Howth (Hart, '92) : Dublin Bay (Waller, f. Jeffreys, '69). 

 iii. Cork (Jeffreys, '67) : R. I. A. Exp., 1885, 1886, Glandore Harbour, 



4 fms., and off Baltimore, 30 fms, (Chaster, '98). 

 iv. Bantry Bay (Jeffreys, '67) : E. I. A. Exp., 1885, Berehaven, 5-25 



fins., and Dursey Sound, 25 fms. (Chaster, '98). 

 V. Roundstone (Alcock, '65 ; Barlee, f. Jeffreys, '67; Standen, '95): 



between Bunowen and Slyne Head (Welch, '96) : Connemara 



(Marshall, '99). 

 vi. Carrahubbuck, Killala Bay, one specimen (Miss A. Warren, '92) : 



KiUala Bay (Marshall, '99) : Donegal (Warren and Barlee, f. 



Eorbes & Hanley, '53). 

 Distribution. — !N"orway to Mediterranean. Madeira. North Atlantic, 

 deep water. 



Family. — Littoeinid^. 



Littorina ohtusata (Linne). 

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

 Exceedingly common, among stones and sea-weeds all round the 

 coast. 



Yar. neritiformis, Brown. Downpatrick (Brown, '44). Yar. 

 falalis, Turton. Larne, plentiful (Jeffreys, '65) : Killala Bay 

 (Miss A. Warren, '92). 

 Bistrihution. — Nova Zembla to Azores. Mediterranean. ?N. E. 

 America. 



Littorina neritoides (Linne). 



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

 i. Belfast Lough, living, common (Hyndman, '58) : north of Ireland, 



common (Praeger, '89). 

 ii. Dublin coast, common : Grreystones (Adams, '78). 

 iii. Waterford coast (Thompson, '56) : Cork Harbour (Humphreys, '45). 

 iv. Bantry Bay (Humphreys, '45) : B. I. A. Exp., 1886, Berehaven, 



5-10 fms., and Ballinskelligs Bay (Chaster, '98). 

 V. Eoundstone (Alcock, '65 ; Standen, '95) : Achill I. (Mrs. Tatlow 



& Praeger, '98). 

 vi. Bundoran (Thompson, '56) : JSTarin, co. Donegal (Mrs. Tatlow, 

 '99). 

 Distribution. — Norway to Mediterranean. Azores. Madeira. 

 Canaries. 



