238 MR. A. S. KEXNARD & MR. R. B. WOODWARD ON [vol. lxxV, 



from the Forest Bed (Cromerian) of West Runton referred to this 

 species do not belong to that form. 



Polita NiTiDULA (Draparnaud). 



All the examples of this species are small though mature, and are 

 much smaller than recent ones. 



Helicella yirgata (Da Costa). 



Only known from Barnwell, where it is not uncommon. The 

 examples exhibit but little variation, and are quite as large as 

 average recent specimens. As a Pleistocene fossil, H. virgata is 

 only known from Ilford and Grays (Essex), Portland (Dorset), 

 Santon and Chudleigh (Devon). 



Helicella itala (Linne). 



The examples from Barnwell Abbey are rather small, and are 

 decidedly flat, while those from Barrington are distinctly higher in 

 the spire. 



Helicella striata (Muller). 



We have provisionally referred to this species a single example 

 from Trumpington ; but Mr. Hugh Watson informs us that a 

 similar shell was obtained from Grantchester, and is now in the 

 Sedgwick Museum. This, or a closely-allied form, occurs in the 

 Pleistocene of Woodston (Huntingdonshire), and in that of Cuxton 

 and Hailing (Kent). 



Hygromia hispida (Linne). 



Three well-marked forms, Avithout intermediates, of this group 

 occur in these deposits. 



(1) A very flat form and always white. It occurs at Barnwell 

 Abbey, Grrantchester, and Trumpington. Elsewhere in the Pleisto- 

 cene it is known from Swanscomb and Crayford (Kent), Clevedon 

 Cave (Somerset), and Fisherton (Wiltshire). 



(2) The form that is always high- spired, with a small umbilicus, 

 and reddish in colour. It occurs at Barnwell Abbe} r and Grrant- 

 chester, while elsewhere in the Pleistocene it is known from Ilford 

 (Essex), Apethorpe (Northamptonshire), Swanscomb (Kent), and 

 Stutton (Suffolk). Examples from Barnwell Abbey were submitted 

 to the late Dr. O. Boettger, of Frankfort, who identified them as 

 K.set'icea Draparnaud (non ~NLii\\ei'=liberta Westerlund), and we 

 have recorded them under that name. It may be noted that both 

 these forms probably occur in the Forest Bed (Cromerian) of West 

 Runton ; but, since only immature examples have been seen, it 

 is impossible to speak definitely. 



(3) A form, as a rule, intermediate in the height of the spire 

 between 1 and 2. High-spired examples are not uncommon ; but in 

 these the umbilicus is always larger than in H. liberta. In colour 

 they are whitish, but never the dead white of the first group. The} r 

 occur at Barrington, Trumpington, and Barnwell Station. 



