CLIMATE OF PLEISTOCENE PERIOD. 



t>2> 



The same author has given us an account of the fauna 

 discovered in the Pleistocene deposits of the Ehine valley. 1 In 

 that region the loss has yielded an assemblage of shells somewhat 

 similar to that of the Wiirzburg list. Many of them are high- 

 alpine and hyperborean forms, and the general facies of the 

 group is decidedly northern. Mr. Prestwich, a number of years 

 ago, drew attention to the fact that certain high-level river- 

 deposits of Pleistocene age in the valleys of Southern England 

 and Northern Prance furnish a group of shells which have not 

 only a very wide range, but one more in a northern than a 

 southern direction ; and he remarked that the general absence of 

 southern species from the deposits in question was also not 

 without its significance. 2 



M. Locard has recently shown that in the Quaternary or 

 Pleistocene deposits of the neighbourhood of Lyons northern 

 forms of molluscs preponderate, the boreal species being com- 

 mingled with many which are still indigenous to that part of 

 Prance. 3 



1 Ausland, 1873, p. 984 ; Geological Magazine, Dec. ii. vol. i. p. 215. 



2 Philosophical Transactions, Part II., 1864, p. 279. 



3 See Description de la Faune Malacologique dcs Terrains Quaternaires des 

 Environs de Lyon. The species lie mentions are as follows : — 



Limax, species undetermined. 



Testacella haliotidea, Drap. 



Succinea putris, L. 



S. elegans, Risso. 



S. oblonga, Drap., var. ragnebertensis, 



Loc. 

 8. joinvillensis, Bourg. 

 Hyalina lucida, Drap. 

 H. nitida, Mull. 

 H. septentrionalis, Bourg. 

 H. subnitens, Bourg. 

 H. hyalina, Feruss. 

 H. crystallina, Mull. 

 Helix rotundata, Mull. 

 H. obvoluta, Mull. 

 H. pulchella, Mull. 

 H. costata, Mull. 

 H. fruticum, Mull. 

 H. strigella, Drap. 

 H. new 



H. hispida, L. 



H. locardiana, P. Fagot. 



H. neyronensis, P. Fagot. 



H. steneligma, Bourg. 



H. elaverana, Mabille. 



H. carthusiana, Mull. 



H. ericetorum, Mull. 



H. costulata, Ziegl. 



H. striata, Drap. 



H. unifasciata, Poiret. 



H. lapicida, L. 



H. arbustorum, L. 



H. nemoralis, L. 



H. hortensis, Mull. 



H. sylvatica, Drap. 



? H. pomatia, L. (very doubtful). 



Bulimus montanus, Drap. 



B. detritus, Mull. 



B. tridens, Mull. 



? B. quadridens, Mull. 



