130 The Mollusca of Cambridgeshire 



by Jenyns 1 . This is based on a single individual found at 

 Linton about IS.'JO. He also mentions having t'nund empty 

 sbells at Heche Chalk Pits in 1827. Possibly these were 

 evidence of recently living individuals. Shells have been 

 found by Mrs Hughes in the Barrington Gravel and also in 

 pre-Roman tumuli, sometimes numerously, at various places, 

 including Upper Hare Park near Six Mile Bottom, Swaffham 

 Prior, Allington Hill and Chesterford. On the whole the 

 evidence is that this pretty form is in Cambridgeshire, as in 

 several other counties, becoming less common than formerly. 



Amphipeplea glutinosa, a species inclined to sudden ap- 

 pearances and disappearances, is recorded by Jenyns* as 

 occurring in 1822, previously to which it had not been 

 recorded in the county, in pools in gravel pits at Bottislia.ni. 

 It was exceedingly numerous in the above year and persisted 

 in diminishing numbers through the next three years, after 

 which it vanished entirely. 



The same part of the county is recorded by the Rev. A. H. 

 Cooke 8 as that wherein Aplecta hypnorum was first noticed in 

 Cambridgeshire. During the wet February of 1852 a quite 

 small puddle in Bottisham Park was crowded with this species, 

 which completely and permanently disappeared a few days 

 afterwards. 



Helicella itala. It is of interest that Pennant 4 mentions 

 "woods in Cambridgeshire" as a locality for this form. 



Helicigona lapicida was found by Jenyns 5 in 1822 at 

 Swaffham Bulbeck and has since been captured at Fen Ditton 

 and as empty shells at Cherryhinton. 



Helix aspersa. A dead sinistral example has been found 

 in the chalk pit at Cherryhinton. 



"Helix pomatia lives locally at Maggots Mount near Little 

 Shelford. This, with the exception of its occurrence at 



1 Observations in Natural History, 184G, p. 32-!. 



2 loc. cit., p. 318. 



:J Cambridge Natural History, Vol. v., p. 46. 



' llritish Zoology, Vol. iv., 1812, p. 302. loc. cit., p. 321. 



