LIMN#/ IDA. oil 
South. 
Beer Crowcombe, near Taunton, uncommon; MWake- Bowell. 
Ilchester, Brympton, Yeovil ; J. Ponsonby. 
Pond at Wellington ; W. Gyngell. 
Var. draparnaldi, Sheppard. 
Bristol ; Jeffreys. 
PLANORBIS GLABER, Jeffreys (=Planorbis parvus, Say). 
This species is not common in our southern counties. I am 
acquainted with but two Somerset records :—Norman remarks 
in his List: “ We have taken it, fine and in great abundance, 
in a large pond by the railway side at the third (?) bridge 
from Clevedon.” 
In Bolton’s paper on a shell-bearing deposit at Dumball 
Island its occurrence at the Avonmouth Dock is noted. 
(In Wilts it is known only from some specimens in the 
Haslemere Museum, collected by Townsend in the neighbour- 
hood of Great Bedwyn in 1851). 
PLANORBIS CRISTA, Linné (= Planorbis nautileus, Linné). 
Widely distributed, on aquatic plants in ditches and ponds. 
There are two forms, often occurring together and equally 
abundant. In one the outer whorl has strong transverse 
ridges, in the other the shell is smooth. Some authorities 
give specific rank to the smooth form (as P. nautileus), and 
consider the ridged form as a variety (v. crista). 
North. 
Burnham ; Cundall. 
Common in the Wincanton district ! 
Weston district, very abundant in some rhines in early 
spring; F. A. Knight. 
South. 
Ilchester ; J. Ponsonby. 
Var. levigata, Adami. 
Common in the Wincanton district ! 
Ilchester ; J. Ponsonby. 
PLANORBIS CARINATUS, Miiller. 
A rare species, but it is possibly often passed over for the 
common P. umbilicatus which it resembles in stature, differing 
chiefly in having broader whorls and in being sharply keeled 
in the median line. According to Leipner it is common through- 
