cooper: on a holocene deposit at boveney. 



819 



Clausilia laminata (Mont.). 



Succiiiea jyutris (L.). 



S. elegans, Eisso. 



Carychiuvi minimum, Miill. 



Ancylus ftuviatilis, Miill. 



Acroloxus lacustris (L.). 



Limnaa aurictilaria (L.). 



L. ixregra (Miill.). 



L'. palustris (Miill.). 



L. truncatida (Miill.). 



L. stagnalis (L.). 



Planorhis corneus (L.). 



P. alb^is, Miill. 



P. Strcemi, Westd. 



P. crista (L.). 



P. carinatus, Miill. 



P. umbilicatus, Miill. 



P. vortex (L.). 



P. contortus (L.). 

 P. fontaniis, Lightfoot. 

 Physa fontinalis (L.). 

 Bithynia tentaculata (L.). 

 B. Leachi (Sbepp.). 

 Valvata inscinalis (Miill.). 

 F. cristata (Miill.). 

 Neritina fluviatilis (L.). 

 Splicer ium corneum (L.). 

 Pisidium amnicum (Miill.' 

 P. siipinum, A. Sch. 

 P. Henslowanum, Malm. 

 P. ])idchcUiim, Jenyns. 

 P. Casertanum, Poll. 

 P. jnisillum (Gmel.). 

 P. nitidum, Jenyns. 

 P. ohtusale, Pfr. 

 P. milium. Held. 

 P. subtriincatum. Malm. 



P. spirorbis (L.). 



Pyramidida rupestris and Vertigo pusilla were the most interesting 

 finds; the latter species still lives at Burnham Beeches, a few 

 miles away. 



Mr. B. B. Woodward, F.L.S., has kindly identified some of the 

 Pisidia quoted above. I am also indebted to Mr. A. S. Kennard, F.G.S., 

 for naming two immature forms of other shells. 



