230 Proceedings of the Royal Physical Society. 
Lacuna puteolus (Turton). 
Turbo puteolus, Turt., Conch. Dict., p. 193, figs. 90 and 91. 
Lacuna puteolus, F. and H., vol. iii., p. 58, pl. Ixxii., figs. 7-9, 
pl. Ixxiv., fig. 9. 
Jeff., doc. cit., vol. iii., p. 348; vol. v., pl. Ixiv., 
fig. 4. 
Frequent. This species has been recorded as fossil from 
Fort William; from the Clyde beds at Dalmuir, Paisley, 
Garvel Park; from the estuarine clays at Larne Lough; and 
from the marine accumulations at Portrush. 
Lacuna pallidula (Da Costa). 
Nerita pallidula, Da Costa, Brit. Conch., p. 51, t. iv., figs. 4 and 5. 
Lacuna pallidula, F. and H., vol. iii., p 56, pl. lxii., figs. 1-4. 
Jeff., doc. cit., vol. iii., p. 351. vol. y., pl. Ixiv., 
fig. 5. 
39 39 
Tare. In its fossil state this species does not appear to be 
so widely distributed as the last. It is recorded from Largo; 
the Clyde beds at Dalmuir and Loch Gilp; from the Larne 
Lough and Belfast estuarine clays; and from the accumula- 
tions at Portrush, County Antrim. 
As living species these three appear to be generally 
distributed around our coasts. 
Littorina, Littorina obtusata (Linne). 
Ferussac. 
Turbo obtusatus, Linn., Syst. Nat., p. 1232, pl. Ixxxvi., figs. 2 and 3. 
Littorina litoralis, F. and H., vol. iii., p. 45, pl. lxxiv., figs. 3-7, and 
p, 49, 
obtusata, Jeff., loc. cit., vol. iii., p. 356; vol. v., pl. Ixv., 
fig. 1, 
93 
Common. 
Littorina rudis (Maton), 
Turbo rudis, Maton, Nat. Hist. and Antiq. West Count., vol.i., p. 277. 
Littorina rudis, F, and H., vol. iii., p. 32, pl. Ixxxiii., figs. 1-7 ; 
pl. Jaxxiy., fig. 1, 
Jeff., loc. cit., vol. iii., p. 364; vol. v,, pl. Ixv., fig. 3. 
o> 99 
Common. These two species appear to be widely dis- 
tributed in the Post-Tertiary deposits of Scotland, and have 
