ng 46 Nelson: Extracts From a Conchologist’s Notebook. 
Here I found Physa hypnorum, Planorbis spirorbis, Limnea 
; 6 igh and ZL. palustris. Proceeding further along the road, 
I came to a number of small ponds, which are situated close 
py. to the cross roads here. The first pond I searched yielded no 
molluscs; the next one I examined had an abundance of 
_ Planorbis sptrorbts and Limnea palustris, the latter being very 
small examples. ter a time, in another part of the same 
pond I began to find Physa hypnorum, and at length was 
_ rewarded by a specimen of Limne@a glabra, and after a diligent 
search I obtained two or three additional examples. I then 
left this pond and tried another, which yielded a goodly number 
‘of Limnea glabra and L. truncatula. 1 may here remark that 
the Z. glabra were small and slender, and many of them were 
possessed of a thickened rib just within the aperture of the 
shell. These ponds and part of the ground round seem to 
@ me, from some of the plants which still survive, to have been 
a common until a comparatively recent time. 
Having reached a small stream that crosses the road near 
_ Wistow, I examined it, but only found Limnea peregra. 
Passing through the village of Wistow, I turned towards 
Cawood, and in a ditch near the latter village I found Physa 
 Aypnorum, Planorbis spirorbis, and Limnea glabra, the latter 
a being of a different form altogether fon those gathered at 
the cross roads between Wistow and Scalm Park, being lecee 
and proportionately broader. 
ving passed the village maypole, | went alongside a 
dried-up canal in front of the castle and noticed skeletons of 
Eels (Anguilla sp.) lying on the soft mud. Arriving: at 
Bishopdyke, I turned to the left and had for some miles a very 
unpleasant walk. The dyke was undergoing the process of 
_ being deepened and widened ; the mud which formed was piled 
up on the roadside which runs alongside the dyke; this gave off 
_ an unsavoury smell, but amongst the drying mud I obtained 
well-preserved specimens of Limne@a peregra, L. auricularta, 
L. stagnalis, L. palustris, Planorbis carinatus, and P. corneus, 
which, from their long burial in the mud had acquired quite a 
sub-fossilised appearance. 
I 
specimens of Limnea auritcularia, and should be pleased to hear 
if any readers have so obtained it. Having passed Biggin, 
which laid to the right, I turned to the left and pop an some 
a place called Manor Garth. Here I got ‘cna of Planorbis 
Naturalist, 
i 
should like here to remark that I have not met with recent : 
ponds, which had evidently at one time bee moat, at 
ae 
