Nichols— J. List of the Marine MoUusca of Ireland. 637 



Family. — Mesodesmatid^. 



Ervilia castanea (Montagu). {Amphiclesma castaneum, Jeffreys, B. C.) 



• • iii-> iv., v., . 



iii. Cork (Humphreys and Jeffreys, f. Jeffreys, '63). 

 iv. E.I. A. Exp., 1885, Berehaven, 5-25 fms. (Chaster, '98). 

 V. Coast of Galway, with the valves united (Barlee, f. Thompson, 

 '56). 

 Distribution. — Belgium. S. England and Ireland to Mediterranean. 

 Azores, Madeira. Canaries. C. Yerd I., " Talisman." 



Family. — Mactkidjb. 

 Mactra solida, Linue. 

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



Generally distributed on sandy coasts in the littoral zone, and 

 common. 



Yar. truncata, Montagu. Generally distributed. Yar. elliptica, 

 Brown. Generally distributed, but in deeper water than the typical 

 form. 



Distribution. — Iceland. Einmark to Spain. ? Mediterranean. 



Mactra subtruncata (Da Costa). 

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



Generally distributed, but not so common as the preceding species. 



Yar. striata, Brown. Strangford Lough (Brown, '44) : Irish coasts 

 (Jeffreys, '63). Yar. ittcsqualis, Jeffreys. Strangford Lough (Adair, 

 f. Jeffreys, '63). 



Distribution. — Einmark to Mediterranean. Mogador. ? Madeira. 

 Canaries. 



Mactra stultorum, Linne. 

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



Generally distributed on sandy coasts in the littoral zone, and very 

 common. 



Yar. cinerea, Montagu. Magilligan (Thompson, '56) : Portmarnock 

 (Walpole, '53a; Thompson, '56; Adams, '78): Youghal (Ball, f. 

 Thompson, '56). 



Distribution. — K'orway to Mediterranean. Mogador. Canaries 



E.I.A. PEOC, SEK. III., vol,. V. 2 T 



