Nichols — A List of the Marine MoUusca of Ireland. 505 



ii. Portmarnock (Warren, f. Thompson, '56 ; Adams, '78) : Dublin 



Bay (Kinahan, '61). 

 iv. Kenmare Eiver (Praeger, '99). 



V. Connemara (Farran, f. Jeffreys, '65) : Eoundstone (Standen, '95). 

 Distribution. — Arctic seas to British Isles. Greenland. IST. E. 

 America. IST. ~W. America. E'. E. Asia. 



Margarita groenlandica (Chemnitz). {Trochus groenlandicus, 

 Jeffreys, B. C.) 



i. "Porcupine" Exp., 1869, North Channel, 40 fms. (Jeffreys, '83) r 

 TurbotBank, dredged sand (Jeffreys, f. Hyndman, '59); these 

 specimens were suspiciously like fossils from a submarine post- 

 tertiary deposit in that locality (Jeffreys, '65). 

 Distribution. — Arctic and northern seas in both hemispheres to 

 N. Ireland and Labrador. 



Margarita cinerea (Couthouy). {Trochus cinereus, Jeffreys, B. C.) 



i., . . . [v.]> • 

 i. In shell-sand from the Turbot Bank, apparently recent ("Waller 

 and Jeffreys, f. Jeffreys, '59) ; regarded as submarine fossils 

 (Jeffreys, '65). 

 V. "Porcupine" Exp., 1869, 173 fms., a young and dead specimen, 

 but apparently recent (Jeffreys, '83). 

 Distribution. — Arctic seas in both hemispheres. 



\_Solariella cincta (Philippi). {Trochus amabilis, Jeffreys, B.C.)] 

 . . . iv., v., . 



iv. " Porcupine" Exp. 1869, 370-722 fms. (Jeffreys, '83). 

 V. "Porcupine" Exp. 1869, 173-422 fms. (Jeffreys, '83). 



Distribution. — Shetland to Azores. Florida and "West Indies 

 (Ball). 



Calliostoma Montagui (W, "Wood). {Trochus Montacuti, Jeffreys, B.C.) 



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



i. Sparingly but widely distributed on the Antrim and Down shores 

 (Praeger, '89), Monstr. scalariform. Larne ("Waller and 

 Jeffreys, f. Jeffreys, '65). 

 ii. Generally distributed on the Dublin coast, but rare. 



