The relations of the two species _Helix nemoralis_ and _hortensis_ provide an illustration of another kind of manifestation of local peculiarity. _H. hortensis_ and _nemoralis_ as usually met with, are two very distinct forms. _H. hortensis_ is smaller and duller, and its peristome is white. _H. nemoralis_ is larger and more shiny, and its peristome is brown. In several anatomical points, moreover, especially in the shape of the dart, there are great differences. For a full account of these peculiarities of the two forms and a discussion of their inter-relations the reader is referred to the elaborate work of A. Lang[14] who has studied them extensively and has also succeeded in experimentally raising hybrids between them. These hybrids were in a slight degree fertile with both the parent species, but up to the time of publication no young had been reared from hybrids _inter se_. Coutagne describes the result of collections made in 62 French localities. Some had exclusively _hortensis_, some exclusively _nemoralis_, and in some the two were found in association. He gives details of five of these collections from which I take the following summary of the more essential facts, omitting much that is almost equally significant. _Locality A_, near Honfleur. Both forms present, each sharply and normally distinguished, without any intermediates. They are thus found in many places. Coutagne instances Müller's observations in Denmark, his own series from the Jura, etc. _Locality B._ Vonges (Côte d'Or), 242 _hortensis_ taken at random, showed 128 with light peristomes (either more or less pinkish or quite white) and 114 with dark _brown_ peristomes; together with 26 _nemoralis_ all with the usual brown peristomes. Of the _hortensis_ 50 were in ground-colour _opalescens_ and 1 _roseus_; and in shape 5 were _umbilicatus_. _Locality C_, about 3 kilometres from _B_. There were found 35 _hortensis_, of which 20 had light peristomes and 15 brown; together with 7 _nemoralis_. Of the _hortensis_ none were _opalescens_; 18 were _roseus_ and none has the shape of _umbilicatus_. _Locality D_, about 1,200 metres from _B_. 147 _hortensis_, of which 4 had light peristomes and 143 had brown. No _nemoralis_ were found. None of the _hortensis_ were _opalescens_ or _roseus_, but 30 were _umbilicatus_. In these localities intermediates of every grade existed between the well-characterised _opalescens_, _roseus_, or _umbilicatus_, and the other forms, but there were no intergrades between the other _nemoralis_ and the smaller _hortensis_, about which there was no hesitation. In the next locality a very different state of things was found.