160 Proceedings of the Royal Physical Society. 
In its living condition, it is a widely distributed species, 
being probably the most common one of the genus. 
Pisidium roseum (Scholtz). 
Prsidium roseum, Scholtz, Schlesien’s L.-und W. Moll., p. 140. 
Jeff., Ann. Nat. Hist., ser. 3, vol. iii., p. 38, pl. ii., 
fig. 3. 
Jeff., op. cit., vol. i., p. 26; vol. v., pl. 1 (suppl.), 
fig. 9. 
Roebuck, op, cit., p. 485. 
93 33 
3) 2) 
This species was observed in only one of the deposits 
referred to here, viz., the Crane Peat, and does not appear 
to have occurred in any of the “Ancient Lake” deposits 
already referred to. 
It is recorded as recent in the “Census” from ten 
counties. 
CLass GASTEROPODA. 
Order PULMONOBRANCHIATA. 
Family LIMNAZID&. 
Planorbis, Planorbis nautileus (Linné). 
Guettard. , 
Turbo nautileus, Linn., Syst. Nat., ed. xii., p. 1241. 
Planorbis nautileus, F, and H., vol. iv., p. 152, pl. exxvi., figs. 6, 7. 
Jeff., op. cit., vol. i., p. 82; vol. v., pl. v. (supp!.), 
fig. 3. 
Roebuck, op. cit., p. 485. 
%) a9 
ce} 99 
We observed this species in two of the deposits here de- 
scribed, viz., the Bank Street and High Street. It was also 
obtained in three of the deposits described in the paper on 
“ Ancient Lakes of Edinburgh,” as well as in “The Kirkland 
of Leven” deposit referred to in the Proceedings for 1889-90, 
p. 337. 
The variety cristata was obtained in the material from the 
Bank Street deposit only. 
Planorbis nautileus, including the variety cristata, appears 
to have a wide distribution, as a living species, in Scotland, 
