170 LAND AND DEESH-WATER MOLLUSKS, 
This rare species is found among dead leaves 
and at the base of trees in woods in a few locali¬ 
ties: in Kent — Ashford, Sevenoaks, Charlton 
near London, Southborough, and Tunbridge 
Wells; in Sussex—Hastings ; in Hampshire— 
Buriton, and Petersfield; and in Gloucestershire 
—Birdlip, Cooper's Hill, and Charlton, near 
Cheltenham. Excepting in the Sussex localities, 
where the soil is arenaceous, the rock formations 
are chalk and oolite. It is not uncommon in 
Central Europe. 
A variety of the above species, but regarded 
as having specific claims by Continental authors, 
is (7. Mortilleti; it has only been added to the 
British list since 1856. It was discovered, by 
Dr. S. P. Woodward, at the roots of ivy in 
woods, on the chalk hills at Charing, Kent; 
by Mr. Prentice, at Charlton-Kings, near Chel¬ 
tenham; and by myself in damp shady places 
among decaying leaves, in Coghurst Wood, 
Hastings. 
G. Rolphii occurs in each of the above districts, 
which makes it the more probable that (7. Mor¬ 
tilleti is but a variety of it. In 0 . Rolphii the 
shell is usually more elongated, and the spire 
more gradually decreasing in breadth towards 
the apex; not ventricose, and suddenly narrow¬ 
ing to the attenuated upper portion of the spire, 
as in G. Mortilleti . It is lighter in colour, with 
