636 Proceedings of the Royal Irish Academy. 



Syndosmya prismatica (Montagu). {Scrolicularia prismatica, Jeffreys, 



B.C.) 



i., ii., iii., iv., [v.], yi. 



i.-iy. Generally distributed on sandy coasts, but sparingly. 

 V. "Porcupine" Exp., 1869, 173 fms. (Jeffreys, '81). 

 vi. Enniscrone, a few valyes (Miss A. "Warren, '92). 

 Distribution. — Iceland. Einmark to Mediterranean. 



Synclosmya tenuis (Montagu). [Scrolicidaria tenuis, Jeffreys, B. C.) 



i., ii., . . v., yi. 



i. Larne Lougb (Thompson, '56). 

 ii. Lissenball, near Swords (Adams, '78) : Portmarnock (Warren, f. 



Thompson, '56). 

 y. Birterbuy Bay (Earran, f. Thompson, '56). 

 yi. Eahan and Inch I., co. Donegal, rare (Hart, '92). 



Distribution. — Norway. British Isles to Mediterranean. 



Eamily. — Donacit)^, 



Donax vittatus (Da Costa). 



i., ii., iii., iy., y., yi. 



Generally distributed and common on sandy shores. 



Var. truncata, Marshall. Magilligan (Waller Coll. in Dublin 

 Mus.) : south and west of Ireland (Marshall, '97) : Killala Bay (Miss 

 A. Warren, '95). 



Distribution. — S'orway to Mogador. ? Mediterranean. 



Donax varieyatus (Gmelin). {D. politus, Jeffreys, B.C.) 



. ii., iii., iy., y., . 



ii. Dublin Bay (Leach, '52). 

 iii. Cork (Leach, '52). 



iy. Bantry Bay (Humphreys, '45 ; Leach, '52 ; &c.). 

 V. Connemara (Brown, '44) : Aran I. (Barlee, f. Thompson, '56) : 

 Boundstone (Dublin Mus., coll. by A, G. More). 

 Distribution. — S. England and Ireland to Mediterranean. 



