148 PAPKIIS, ETC. 



Genus Achatina. Lamarck. 

 A. acicula, Müller. Buccinum terrestre, ^lat. and Ruck., 

 Trans. Linn. Soc, vol. viii., p. 139. Roots of grass, 

 Clevedon Hill ; Mendips, near Wells ; and among rcjecta- 

 menta of the River Avon. — A. M. N. Taunton. — E.ev. 

 W. R. Crotcli. On Leigh and Clifton Downs.— Miller. 



Genus Succinea. Draparnaud. 



S. putris, Linnfcus. Helix succinea, Mat. and Rack., 

 Trans. Linn. Soc, vol. viü., p. 218. Abundant. Oeca- 

 sionally very large in Kenn Moor. 



S. Pfeijferi, Rossmässler. Perhaps distinct from the 

 last, and a much scarcer sliell. Found in ditches along 

 tlie sea niargin near Clevedon, and a few otlier placcs. 



Farn. LIMNtEAD.^. 



Genus Piiysa. 



P. fontinalis, LInnajus, Bulla fontinalis, Mat. and Rack., 

 Trans. Linn. Soc, vol. viii., p. 126. Widely distributed 

 throughout the county, but not generally common. 



P. hypnorum, Linna?us. Bulla hypnorum, ]\Iat. and 

 Rack., Trans. Linn. Soc, vol. viii., p. 127. Very local. 

 Dulcot, near Wells ; Yatton ; ditch near the Pill, Clevedon ; 

 Weston-super-Mare. More common in the spring months, 

 and often found in grassy ditches which are quite dricd up 

 in the summer. 



Genus Plakorbis. Müller. 



P. corneus, Linnreus. Very abundant in the Moor 

 ditches ; but rare, if not altogether absent, at higher levels. 

 It delights in p( aty watcr. 



P. albus, Müller. Plelix alba, ISIat. and Rack., Trans. 

 Linn. Soc, vol. viii., p. 192. Scarce. Found in a few 



