MONOGRAPH OF BRITISH LAND AND FRESHWATER MOLLUSCA. 475 
SUB-GENUS Discus Fitzinger. 
Pyramidula rotundata (Miiller). 
Classification and Affinities.—Rev. E. W. W. Bowell has expressed 
the opinion that P. rotundutu is easily distinguished by its radula from 
other Helicids, and that it is apparently an earlier form uniting certain 
features, as the tendency to multicuspid marginals especially in young 
specimens, is reminiscent of the Pupide, but with a general facies of the 
group, embracing virgatu, cantiana, granulata, hispida, rufescens, revelata, 
etc., and adds that P. rotundata may perhaps be added to the group of 
Helices distinguished by an Arionid radula. 
The Helix omalisma of Bourguignat is, according to M. Granger, merely 
a very depressed form of Pyramidulu rotundata found on the mountains 
around St. Jean de Luz, Basses Pyrénées, France. 
Enemies.—It is one of the species preyed upon by the Stockdove, Mr. 
C. E. Wright stating that 162 specimens have been found in the crop of a 
single bird at Frodingham, Lincolnshire. 
It is rare at Thrush-stones in the same county, according to the Rev. 
E. Adrian Woodruffe-Peacock. 
Geological Distribution.—Found abundantly in the Pleistocene 
lacustrine deposits at Woodston, Huntingdonshire, by Rey. C. E.Y. Kendall. 
Hoxocengt.—In Bucks., it has been found in the alluvial brick-earth and 
in the superimposed deposits at Boveney by Mr. J. E. Cooper. 
In North Lincoln, it has been found at Greetwell by Mr. J. F. Musham. 
In South-east Yorkshire, the Rev. E. P. Blackburn records the finding of 
specimens by Mr. Mortimer in ‘“‘barrows” of the Bronze age, and from the 
grave and body of a prehistoric mound im Willie Howe’s plantation near 
Sledmere. In Mid-west Yorkshire, Mr. J. W. Jackson found it abundantly 
in a hill-wash of probably Neolithic age in Clapdale near Clapham. 
Geographical Distribution.—Mr. F. H. Sikes has added a province 
in Holland to the known habitats of this species, having found specimens 
at Texel, Friesland, in Aug. 1909. 
In France, M. Berenguier includes this in his list of //edices found in the 
department of the Var. 
In Denmark, it is described by Dr. Steenberg as very plentiful. 
Var. turtonii Fleming. 
ENGLAND. 
York Mid W.—Grimbald’s Crag, Knaresborough, May 1909 ! W. E. Brady. 
York N.E.—Cayton Bay and Carnelian Bay, Searboro’, Sep. 1909 ! W. E. Brady. 
FRANCE. 
Indre-et-Loire—Forest of Loches, April 1912! F. H. Sikes. 
Var. sealaris Fér. 
ENGLAND. 
Herts. —Aldbury, June 1909 ! C. Oldham. 
Northampton—Sub-vars. pyramidalis and subscalaris, Haselbeech, May and Oct. 
1904, Rev. W. A. Shaw. 
AUSTRO-HUNGARY. 
Carinthia—Dr. von Gallenstein records ‘highly-wound” shells as somewhat 
common in the ‘‘ Garten des Schlosses Maria Loretto am Worthersee.” 
