53 
L1MNEA maxima. 
TAB. DXXVIIL —Jig. 1. 
Spec. Char. Ovate-elongated, rather obtuse ; 
whorls about 6, slightly convex ; aperture 
narrow, occupying less than half the length of 
the shell. 
Readily distinguished by the bluntness of its outline 
and the large proportion which the spire bears to the 
whole shell. The columella appears to be thin. 
The Rev. Professor Sedgwick was so fortunate as 
to discover this large species of Limnea in the Stone 
Quarries at Binstead near Ride, in the Isle of Wight, 
this spring ( 1826). The specimens have lost almost all 
the exterior crust of the shell, the interior only adhering 
to the cast. 
LIMNEA columellaris. 
TAB. DXXVIIL— /g. 2. 
Spec. Char. Ovate-p6inted ; spire short ; whorls 
about 5, convex ; aperture wide, above half 
the length of the shell; columella much twist- 
ed and very thick. 
No other Limnea has so remarkable a columella : it is 
further distinguishable from most other species by the 
roundness of the whorls and shortness of the spire. 
Collected in the Hordwell Cliff by Charles Lyell, 
Esq. during a careful examination of the Freshwater 
Strata there, — the valuable results of which we expect 
shortly to see published ; it is accompanied by Planorbis 
rotundatus of Brongniart. 
