VOL. XIV. (3) HOLOCENE DEPOSITS 199 
NOTES ON THE SPECIES. 
Agriolimax agrestis and Arion ater. The slugs are 
represented by these two species, both of which also 
occurred at Westbury. 
-Punctum pygmeum is represented by a single example 
as at Westbury. It is not a common species, though its 
small size may probably be the cause of its frequently 
_. passing unnoticed. 
Hygromia granulata is an interesting form; but it was 
only represented by three examples; whilst of its near 
ally, H. hispida, over one hundred specimens were noted. 
Helix aspersa is represented by an apical fragment; 
but there can be no doubt of the identification. Though 
for long considered a modern introduction, it has been 
clearly demonstrated during the past few years that such 
is not the case. In a fossil state it is known from the 
kitchen middens of Hastings (Neolithic), and Harlyn Bay, 
Cornwall (age uncertain, but pre-Roman); from the hill- 
wash at St. Catherine’s Down, Isle of Wight (Neolithic) ; 
and the pre-Roman deposits at Greenhithe, Walthamstow, 
and Reigate. It is quite unknown in a fossil state on the 
Continent, but occurs in the Pleistocene of Algiers. Its 
distribution in these Islands also supports the view that 
it is really indigenous. In all probability its true home 
is in the south-west of Europe, and it has reached these 
islands over land now submerged beneath the Atlantic, in 
the same manner that the slug Geomalacus maculosus 
reached Ireland, and Hygromza montivaga, West, colonised 
Cornwall, and Helix prsana, Cornwall, South Wales and 
the Channel Islands. Though the distribution of He/ex 
aspersa has been greatly extended in modern times by 
commerce, there can be no doubt that it has reached these 
islands without the aid of man. 
O2 
