246 
LAND AND FRESH WATER SHELLS. 
assured me that Crows watch on the banks of rivers 
for these shell-fish, fly with them into the air, then 
drop them on some rock in order to break the shell, 
and descend to devour the contents. Grows are 
reported to destroy and feed on the Swan-mussel 
in the same manner. ■ 
(UNIVALVE.) 
Limacellus parma.—Found in Limax maximus. 
Limacellus obliquus_In the common Field-slug. 
Possibly Limacellus variegatus is to be found here, 
but it has not come under my notice as yet. 
Limacellus unguiculus.—In Limax carinatus 
of Leach. Common in gardens. 
* Testacellus haliotideus.—I have one specimen 
of this shell, and it seems as yet to have been found 
only here and at Bideford. 
Testacellus Maugei.—I found the slug to which 
this shell belongs in my garden in Park-street, 
where it does not seem likely it had been intro¬ 
duced with any exotic plants. It occupied damp 
and shady ground, and apparently in consequence 
of the plenty of earth worms in that spot. (See 
woodcut.) 
Vitrina pellucida.—Among damp moss. Dead 
shells are very frequent under stones. I think I 
have found V. elongata , or at least elongated spe¬ 
cimens of pellucida . 
Cyclostoma elegans.—I found this species on 
Berry Head, but not plentifully. 
Helix aspersa.—Common in hedges and fields. 
Helix hortensis.—In hedges and gardens. Not 
common. 
Helix nemoralis.—Common in hedges and gar¬ 
dens. In winter I find this and the two foregoing 
species either lying loose in warm hedges with 
their apertures sealed up, or cemented firmly to 
stones or old trees. A few remain quiescent with- 
