S P. umbilicatus, P. corneus, P. contortus, Physa font. snails, Limnea 
286 THE YORKSHIRE NATURALISTS’ UNION AT ASKERN. 
marly in character, and contained numerous opercula of Aythinia 
tentaculata. Moles were doubtless responsible for the exposure of 
the shells on the surface, as the soil was thrown up during the carry- 
ing on of their subterannean operations. In order to prove that 
these little mounds were not the only depositories of the shells we 
excavated away from them about a foot deep and again met with 
shell remains. This seemed conclusive evidence of the lacustrine 
character of the district and that the shells to be found on the 
ce had been really conveyed through the agency of the moles 
from these deposits. Planorbis vortex, P. umbilicatus, P. corneus, 
P. contortus, Limnea peregra, L. stagnalis, L. palustris, Bythinia 
tentaculata and Valvata cristata are species of mollusca still common 
all over the district, whilst Vivzparus,as far as we know, is not known 
at present to occur anywhere in the district. At the same time it 
would not be wise to be dogmatic on this point, as from the fact that — 
the remains of the shell are so common there is a high degree of 
probability that it may have survived in some of the dykes. In 
addition to the shells we have named, a specimen of Planorbis 
fontanus (Lightfoot) was obtained, which Mr. Nelson informed the 
party had not been to his knowledge previously recorded from the 
deposit. im 
The remainder of the time was spent at Shirley Pool and the 
Jungle. Very little was seen of the terrestrial mollusca, whilst odd 
examples of aquatic species could be seen in the jungle some 
_ distance from the water, apparently where they had been left asthe = 
banks became dried up. Such species as Zimnea palustris were 
even taken in the middle of the jungle, which evidently, in rainy — 
seasons, must become entirely inundated. A very interesting — 
round the body whorl. The following is a complete list of the 
- molhisca, noted ae the day :—Arion ater var. —— (W.D. R.), 
: Hi. nitiduda. It wittiin Fie PS a iW of aspersa, 
oo: nemoralis, A. cantiana, H. hispida, Cochlicopa lubrica, Succinea 
 putris, , Carychium minimum, Planorbi: norbis fontanus, cheese nautileus 
ay (pond. near Burghwallis, W. D. R.), P. vortex, P. carinatus, 
—— peregra, L. stagnalis, L. palustris, Velletia lacustris (Shirley Pool), 
_  Bythinia tentaculata, B. leachit, Valvata piscinalis, V. cris eas 
if = ceed corneum, Pisidium Sontinale, and P. pusillum . 
r the Entomologi cal Section, in the absence of all. sin cbcotin - 
iven: as ‘Mr. H. HL earn MRCS, of I Doncaster, 
oe, of Hull. : 
