The Ancient Lake of Llie. 163 
TERRESTRIAL. 
Family Lrmacip@. 
Arion sp. ? Arion, 
é Férussac, 
We frequently find the calcareous grains that go to make 
up the internal shell of these slugs, in the ancient lake 
deposits, but there does not appear to be any marked differ- 
ence between the shell-granules of the various species to 
enable one species to be identified from another with any 
ereat certainty. 
Limax sp. ? Limax, 
Linné, 
The shells or Limacellw of some species of Limaz are of 
frequent occurrence in the deposits, but it is difficult to 
determine, with any degree of certainty, to what species they 
may belong, as these shells, which are internal, and are 
usually much softer than the external shells of ordinary 
snails, undergo change of appearance more rapidly, and are 
also more liable to erosion, caused principally by the presence 
of carbonic acid, arising from the decaying vegetable matter 
of the old lakes. 
Family HEuicip&. 
Succinea putris, (Linné). Succinea, 
Draparnaud. 
Helix putris, Linn., Syst. Nat., ed. xii., p. 1249. 
Succinea putris, F. and H., vol. iv., p. 132, pl. exxxi., figs. 4, 5. 
Jeff., op. cit., vol, i., p. 51; vol. v., pl. viii. (suppl.), 
fig. 4. 
ae », Roebuck, op. cit., p. 450. 
3? be) 
This species was observed in all the deposits described in 
this paper; it is also recorded from the “Kirkland Marl,” 
but does not appear to have been noticed in any of the 
deposits described in the paper on “The Ancient Lakes of 
Edinburgh;” the absence of this and several other species 
from the deposits described in that paper may be due to the 
small quantity of material that was available for examina- 
tion. From first to last several hundredweights of the Elie 
deposits have passed through Mr Bennie’s hands. 
