146 
THE NATURAL HISTORY OF STEEP HOLM. 
MOLLUSCA.— By F. G. Pearcey, F.R.P.S.E. 
In the " Mollusca of Somerset," by Mr. E. W. S wanton, a list 
of about a dozen species is recorded for the Steep Holm and the 
Flat Holm ; and the Cardiff Naturalists' Society records for 1885 
that four species and one variety were seen on the Steep Holm. 
Since that date no systematic list appears to have been published. 
On the present occasion specimens of most of these including 
three species and one variety of Hyalinia and many other kinds 
were obtained. 
The full list of the day's finds is the following : — 
IvIMACIM. 
Agriolimax agrestis L. Not uncommon tin damp corners of 
rock and under stones near the ruins of the hotel and cottage on 
the summit of the Island. 
Hyalinia nitidula Drap. Comparatively rare under stones. 
Var. nitens Mich. Abundant in sheltered nooks and under 
stones, especially in damp places and at the roots of nettles. 
Var. cellaria Mull. Few obtained in company with and in 
similar localities to H. nitidula. 
H. crystallina Mull. Very rare ; near the ruins of the cottage. 
Helicim. 
Helix aspersa Mull. var. flammed Picard. Moderately common 
near the Hotel ruins. 
Var. albo-fasicata Picard. Common near the old and new 
habitations and enclosures, and in all suitable places. 
Var. nigrescens Mog. Comparatively rare in rock crevices. 
H. nemoralis L,. var. rubella Picard. var. libellula Risso. 
At the time of our visit this species was very scarce ; several 
young specimens were taken, which would suggest that it was 
too early. 
As in the case of H. aspersa no typical forms were taken ; both 
varieties were found on the summit. 
Var. olivacea Risso. In ruins of cottage. 
Var. fascialba Picard. On cottage wall. 
Var. Major Fer. In similar situation. 
H. hispida L,. Abundant in suitable localities. 
H. virgata De Costo ( = Helicella virgata De Costa). Rare at 
the time of our visit on the west side. 
H. caperata Mont. ( = Helicella caperata Mont.). Compara- 
tively rare on the S.E. side. 
Helicigona lapicida L. Very rare ; on south side. 
Haplogona. 
Pyramidula rupestris Drap. ( = Helix rupestris Drap.) 
Moderately common in rock crevices. 
P. rotundata Mull. ( = Helix rotundata Mull.) Comparatively 
rare. 
