Census of Lincolushive Land and Freshwater Mollusca. 307 
good friends who has investigated various parts of the county. 
Irom the point of view of completing the record for certain 
representative common or generally distributed species—A rion 
ater has been noted in 32 cut of the 34 districts, Limneea peregra 
in 31. Agriolimax agrestis and Hygromia hispida in 30, Helix 
aspersa and H, nemoralis in 29, Bythinia tentaculata in 27, Hyalinia 
cellaria in 26, Cochlicopa lubrica in 25, Pyvamidula rotundata 
in 20, Spheerium corneum in 19, and Anodonta cygnea or A. anatina 
in 17, and when the complete range is ascertained for the greater 
number of these, the list may be considered as ready for 
publication. 
There are various species which yet remain to be discovered. ° 
It is within the bounds of possibility for Malacolimax tenellus 
to turn up on primitive land, Hygromia fusca ought to occur 
somewhere, various species of Vertigo, such as V. antivertigo, 
V. moulinsiana, and V. pusilla, await discovery, Planorbis glaber 
should turn up, the occurrence of Limneea glabva should be 
confirmed by its discovery in a new locality, the only one on 
record being now destroyed, and Acicula lineata ought to reward 
search in the woods, and it is hoped that our conchologists may 
be successfu] in finding some if not all of them. 
Of work which non-conchologists can do to assist us, there 
are two suggestions to make. First, that the big swan-mussels 
occurring in canals and rivers and large sheets of water should be 
sent for determination from as many districts as possible. Second, 
that collections of living slugs should be sent to me, in tightly 
closed air-tight tins, for my examination. 
I may add that to secure greater value and interest we 
desire more detailed information than bare records. Notes not 
merely as to locality, but as to dates, habitats, environment, 
geological and physiographical associations, life-histories, etc., 
and for the introductory observations, biographical and other 
notes on the Lincolnshire conchologists and their work will be 
much valued ; and from members who are photographers views 
of characteristic localities and habitats, and snap-shots of 
collectors, etc. 
