BTTLLEN : HOLOCENE LA.ND -SHELLS AT EEIGATE. 327 



latter at Bath neither found nor heard of the discovery of a single 

 siDecimen either living or dead, although the Eomans occupied the 

 spot more than 400 years. It seems strange that the Eomans could 

 have introduced a snail which in England they never used. Again, 

 Jeffreys^ says: "in all probability this kind of snail was not known 

 to them, as another species (H. lucoruni) takes its place in Central 

 Italy." 



At the Horseshoe deposit S. pomatia occurred at depths of 1ft. 9 ins., 

 2ft., 2ft. Sins., 2ft. 6 ins., and 2ft. 9 ins. (fragments), and a young 

 individual at 3 ft. 6 ins. 



I found an early form of jSTeolithic scraper, with bulb and eraillure, 

 at a depth of 2 ft. 6 ins., so that probably Helix pomatia, as well as 

 Helix aspersa, is of JSTeolithic age. 



Clausilia Rolpliii (Gray) occurred at a depth of nearly three feet. 

 It has been recorded only from Kent, Sussex, Hants, and Gloucester- 

 shire, according to Mr. J. C. Mansel-Pleydell, F.L.S., F.G.S., and, 

 he adds, Dorset,- but Mr. Lionel Adams ^ records all the British 

 ClausilicB for Surrey. I have not found C. Rolpliii living at Eeigate. 

 It occurs in the Pleistocene deposits of Copford* and Clacton,* and 

 North-east London,^ but it is not recorded from Barnwell, Grantchester, 

 or Barrington. It occurs in Kent as high as 450 feet above O.D. 



Pomatias reflexus occurred abundantly throughout the section. 



The internal granules of Avion ater were so numerous between the 

 two and three foot levels that I ceased to collect them. The 

 abundance of this moisture-loving mollusc, as also of Helicigona 

 arhustorum and Carychium minimum, points to a far damper condition 

 of the locality than at present obtains. Helicigona arhustorum is now 

 extinct in the neighbourhood of the Horseshoe Pit, although fine 

 specimens were procurable a few years ago. from an osier-bed near 

 Eedhill Station. 



Helicella Cantiana so far occurs only in the upper two feet of the 

 deposit. 



An abnormally large thick internal shell of Limax maximus is worth 

 noting. This was from near the 2 ft. 6 in. horizon. It measures 



3_" \^ 3. " w i'/ 



8 /^ 1 6 ^ s ' 



Ccecilianella acicula was extremely abundant throughout. 



Buliminus montanus occurred (two specimens) at the 2 ft. and 

 2i ft. levels respectively. It occurs in the Pleistocene of Barnwell,^ 

 Grantchester," and Clacton,'' and is still living in the Thames Valley, 

 but has not hitherto been recorded for this part of England. Like 

 Helicigona arhustorum, Helicodonta ohvoluta, and Clausilia Rolphii, it 

 is very restricted in its range, and seems slowly dying out. 



1 Brit. Oonch., vol. i, p. 178. 



^ Mollusca of Dorset, p. 17. 



3 British Land and Fresh-water Shells, 2nd ed., p. 192. 



* Kennard & Woodward : Essex Naturalist, vol. x, p. 108. 



* B. B. Woodward: Proc. Geol. Assoc, vol. xi, p. 55. 

 " Mrs. Hughes, op. cit. 



' Kennard & Woodward, op. cit. 



