The Raised Sea- Bottom of Fillyside. 229 
Family TRocHIp#. 
Trochus cinerarius, Linne. Trochus, 
Rondebetius. 
Trochus cinerarius, Linn., Syst. Nat., p. 1229. 
F. and H., vol. ii., p. 516, pl. Ixv., figs. 1-3. 
Jeff., lec. ¢it... vok wk,p- 809; vol. v., pl. lzii., 
fig. 3. 
> 23 
3) ~ 
Common. As a fossil this species is frequently found in 
the Post-Tertiary deposits throughout these islands, and as a 
living species it is abundant everywhere on stones and sea- 
weed at low-water mark. 
Trochus umbilicatus (Montagu). 
Natica wmnbilicatus, Mont., Test. Brit., p. 286. 
Trochus umbilicalis, F. and H., vol. ii., p. 519, pl. lxvi., figs. 1-4. 
Trochus umbilicatus, Jett., loc. cit., vol. ili., p. 312; vol. v., pl. Ixii., 
fig. 4. 
Frequent. This species has been recorded from the 
estuarine clays at Larne Lough, and from the marine 
_ accumulations at Portrush, County Antrim. 
As a living species it is not so widely distributed as the 
last. 
Family LITTORINID. 
Lacuna divaricata (Fabricius). Lacuna, 
Turton. 
Trochus divaricatus, Fabr., Faun. Green)., p. 392, figs. 7 and 8, pl. Ixxxvi., 
figs. 6-8. 
Lacuna vincta, F. and H., vol. iii., p. 62, pl. Ixxii., figs. 10-12; 
pl. lxxiv. 
Lacuna divaricata, Jeff., loc. cit., vol. iii., p. 846; vol. v., pl. Ixiv., 
fig. 3. 
Rare. As a fossil this species appears to be generally 
distributed in Scotland, being recorded from Largo and 
several places on the Clyde, as well as from Aberdeen and 
Fort William. It has also been obtained in the Belfast 
and Larne Lough estuarine deposits in Ireland, from the 
Norwich or Mammalian Crag in England, and from the 
Continent. 
