48 



PLIOCENE MOLLUSCA. 



given above have an exclusively northern range, as well as to compare them with 

 those of a Pleistocene deposit like that described lately by the Rev. C. E. V. Kendall 

 at Woodston, near Peterborough, from which nine species now more or less con- 

 fined to the sub-Arctic region have been obtained,^ 



Distribution of thk Land and Freshwater Shells op the Crag. 



TERRESTRIAL. 



Sphyradium edentulum (Draparnaud) 



Pyramidula rysa (S. V. Wood) 



— suttonensis (S. V. Wood) 



Eulota fruticum (Miiller) 



Hygromia incarnata (Miiller) 



— hispida (Linne) 



— ruhiginosa (A. Schmidt) 



Vallonia pulchella (Miiller) 



— excentrica, Stevki 



Helicodonta lens (Feriissac) 



Helicigona arbiistorum (Linne) 



Helix lactea, Miiller 



— nemoralis, Jjinne 



— hortensis, MixWtiv 



Cochlicopa luhrica (Miiller) 



Jaminia mu-icorum (M.iil\er) 



— cylindracea {Da, Costa,) 



Clausilia pliocena, S. V. Wood 



Succinea elegans, Risso 



— obionja, Draparnaud 



— ^Mfris (Linne) 



Carychium ovatnm, Sandberger 



— TJiinimttm, Miiller 



Pomatias Harmeri, Kennard 



AQUATIC. 



Acroloxus lacustris (Linne) 



Limnxa butleyensis, Kennard and B. B. Woodward 



— palustris (Miiller) 



— Harmeri, Kennard and B. B. Woodward ... 



— ^ercje)' (Miiller) , 



— Woodi, Kennard and B. B. Woodward 



— auricularia (L.) var. ac«f a, Jeffreys 



Planorhis corneus (Linne) 



— prxcursor, Kennard and B. B. Woodward 



— spirorhis, Miiller 



Palii,destrina Beevei, Kennard and B. B. Woodward 



Lithoglyphusfuscus (Pfeiffer) 



Bithynia tentaculata (Linne) 



Vivipara glacialis (S. V. Wood) 



— wtedia (S. Woodward) 



Valvata cristata, Miiller 



— piscinalis (Miiller) 



Corbicxda fluminalis (Miiller) 



Sphxrium corneum (Linne) 



Pisidium amnicimi (Miiller) 



— astartoides, Sandberger 



— casertanum (FoW) 



— supinum, A. Schmidt 



— Henslowanum (Sheppard) 



Red Crag. 



Icenian, 



II 



Recent. 



1 Jouru. Coucliol., vol. xiv, p. 85, 1913. 



