43 
and in the third place, although Mr. Jeffreys has made a 
statement to the contrary, they unquestionably often do live in 
company. 
Now if two forms of a shell, or of any other organism grow 
together under precisely the same circumstances, they ought to 
have a good claim to specific distinction, for there is no external 
circumstance to explain the difference. If we find a large 
strong snail in a cabbage garden, and a small thin one, bearing 
considerable resemblance to it, in a barren and limeless district, 
there may be great reason to expect they are the same species, 
and that the differences between them are simply due to the 
different circumstances about them. A snail shell from 
G-uernsey, whose granite rocks are deficient in lime, presents a 
curious contrast with a snail shell from a limestone district in 
England. But were two such snails found together in the 
same cabbage, there would be great reason to suspect specific 
difference. 
It is quite true that the white and brown lipped snails very 
frequently live apart. To take local illustration, in Skelton 
Lane you will find only white lips, and I may say the same of 
Dringhouses, while on the Bishopthorpe Eoad I have only 
found brown lips. However, on the Malton Eoad you will 
find brown and white lips living together, and in many places 
about Scarbro’, not excluding the Spa, you will find the same 
thing. From these reasons I am strongly inclined to believe 
that Helix hortensis is a distinct species from H. nemomlis, 
H. hyhrida^ the pink lipped form, has the shape, size, and 
texture of H, hortensis, but I must admit I have found it in 
company with that species both at Scarbro’ and York. 
Many years ago I noticed a curious habit of these snails 
which I see has been lately described by Mr. Eimmer in his 
excellent book on our Land and Freshwater Shells. I was 
walking through a part of Danes Dike, near Flambro’ Head, 
when the trees presented a most extraordinary appearance, 
being stuck all over with “ happy couples ” of pink and yellow 
snails. I have several times tried to witness this phenomenon 
again, but have never succeeded, nor can I devise the reason of 
it. Knowing as we do the partiality of thrushes for these 
