122 THE ZOOLOGIST. 
THE LAND AND FRESHWATER MOLLUSCA OF SUSSEX. 
By tae Epiror. 
(Continued from p. 94.) 
Bulimus obscurus. The Dull Twist Shell.—Common during 
the summer and autumn months on the trunks of trees, especially 
the beech, and at other seasons under stones and dead wood, as 
well as in moss on old walls, but when very young it often escapes 
notice as a shell. The Rev. Revett Sheppard, in a paper in the 
‘Transactions of the Linnean Society,’ says :—“ These snails, par- 
ticularly in their young state, show great sagacity and ingenuity by 
covering themselves with a coat adapted to the different situations 
in which they are found, and when so covered it is almost impossible 
for any other than a conchological eye to discover them. If its 
abode be on the trunk of a tree covered with lichen, then is the 
epidermis so constructed as to cause the shell to resemble a little 
knot on the bark of the tree covered with such substance. If on 
a smooth tree, from whose bark issue small sessile buds, as is 
frequently the case, it will pass off very well for one of them, and 
on a dry bank or the lower part of the body of a tree splashed with 
mud, its appearance will be that of a misshapen pointed piece of 
dirt.” When the shell is fully developed, this disguise is less 
perfect, although the coating of extraneous matter is still con- 
spicuous. 
It is somewhat curious that none of the Sussex lists include 
the allied Bulimus acutus, which, according to Mr. Gwyn Jeffreys, 
is to be found on downs and sand-hills on the sea-coast from 
Sutherlandshire to the Channel Islands, as well as throughout 
Wales and Ireland. There can be little doubt that it occurs in 
Sussex, and will be found if looked for in the situations indicated. 
Bulimus montanus, ov lackhamensis, as it is styled by Messrs. 
Forbes and Hanley, differs from Bulimus obscurus chiefly in size, 
being at least four times larger. I have specimens procured at 
Selborne, Hants, and should therefore expect to hear of its 
occurrence in Sussex, where it has possibly been overlooked. 
Pupa secale vel junipert. The Common Chrysalis Shell.— 
Plentiful on the South Downs wherever juniper-bushes occur. 
I have specimens from Newtimber. In the “ Home Pit,” near 
Lewes, it is common under loose chalk-stones.—U. It is found 
