226 Proceedings of the Royal Physical Society. 
Family TELLINIDA. 
Tellina, Tellina tenuis, Da Costa. 
Linne. 
Tellina tenuis, Da Costa, Brit. Conch., p. 210. 
F. and H., vol. i., p. 300, pl. xix., fig. 8. 
Jeff., loc, cit., vol. ii., p. 8379; vol. v., pl xin, aaa. 
39 9? 
Moderately common. As a fossil this species has been 
obtained in the marine accumulation at Largo, in the Post- 
Tertiary clay at Kyles of Bute, and in the estuarine clay at 
Belfast. 
This species is found living on all sandy beaches at low 
water mark. 
Tellina fabula, Gronovius. 
Tellina fabula, Gron., Zoopb., vol. iii., p. 268, t. 18, fig. 9. 
F. and H., vok i., p. 302, pl. xix., fig. 9: 
Jeff., loc. cit., vol. ii., p. 882; vol. v., pl. xli., fig. 2. 
a9 2) 
Rare. In its fossil condition this species has been observed 
in the accumulation at Largo; in the Post-Tertiary clays of 
the Clyde beds at Garvel Park, Greenock, and Loch Gilp; 
and in the estuarine clay at Belfast. 
This species is found living in sandy bays all round the 
British coasts. 
Family MAcTRID. 
Mactra, Mactra solida, Linne. 
Linne. 
Mactra solida, Linne, Syst. Nat., p. 1126. 
Me Mand B., yol.4., p. 351, pl. Xx, ties ba 
= 5,  Jeff., loc. cit., vol. ii., p. 4155; vol. v., pl. xiii 
Common. Young specimens, apparently belonging to this 
species, were observed in the material. 
Mactra subtruncata (Da Costa). 
Trigonella subtruncata, Da Costa, Brit. Conch., p. 192. 
Mactra subtruncata, ¥.andH., vol.i., p. 358, pl. xxi., fig. 8; pl. xxii. fig. 2. 
3 * Jeff., Joc. cit., vol. ii., p.419; vol. v., pl. xliii., fig. 8. 
Rather rare. Asa Post-Tertiary fossil this species has been 
obtained at Largo, and in the Clyde beds at Bute, Cumbrae. 
This is widely distributed as a living species. 
