108 Address to the Lincolnshive Naturalists’ Union. 
correspond to this is Hasthorpe, near Willoughby, to which 
place, as in duty bound, Mr. Kew and I made a joint pilgrimage 
on the roth of May, 1906, and were rewarded by finding the 
little creature; so that, if our version of the place-name be 
correct, another of the Listerian species was verified on the 
original ground. 
The fourth species mentioned as found in many places in 
the county is Helicigona lapicida, the stone-cutter snail, a some- 
what large shell shaped like a lens with sharp edge, which has of 
course been collected by us in various places. 
In addition to these four definitely recorded and others 
mentioned definitely as only found in Yorkshire, Cambridgeshire, 
or Buckinghamshire, there are 16 of which Lister speaks in such 
manner as to imply without doubt that he saw them in our 
county as well as elsewhere, and which we can therefore regard 
as Lincolnshire shells of the first record. These are—Helix 
aspersa, H. nemoralis, Helicigona avbustorum, Zua lubrica, Clausilia 
bidentata, Helicella itala, Limax maximus, Agvriolimax agrestis, Avion 
ater, Bythinia tentaculata, Limnea stagnalis, Limnea peregra v. ovata, 
Succinea putris, Physa fontinalis, Planorbis corneus, and Pl. umbilicatus, 
all of them well known to us as Lincolnshire shells or slugs at 
the present time. 
We may therefore regard the molluscan fauna of Lincoln- 
shire as amounting in 1678 to 20 species, all of them found in 
the district which has been perhaps the best-worked one in the 
county, the neighbourhood of Louth, and more especially the 
Burwell estate. 
Another species which is an inhabitant of the County now 
but does not appear to have been found in it by Lister himself, 
whose localities are Cambridgeshire and Yorkshire ones, is 
Vivipara contecta, formerly known as Paludina listeri, one of the . 
various species named in honour of Martin Lister. 
The descriptions of these species, the accounts of their 
localities, habitats, mode of life, etc., are all set forth in strictly 
scientific fashion, just as would be done in modern works, and 
quite as free from fabulous or indefinite writing—and Lister, 
like Ray and Willughby, thus anticipated modern scientific 
