A manual of the land and fresh-water shells of the British Islands / with figures of each of the kinds. By William Turton, M. D.

  • Turton, William, 1762-1835.
Date:
1840
Catalogue details

Licence: Public Domain Mark

Credit: A manual of the land and fresh-water shells of the British Islands / with figures of each of the kinds. By William Turton, M. D. Source: Wellcome Collection.

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    the subject, and reference has been made to such of their observations as have appeared to be of sufficient importance to find a place in a work which is in- tended only as a manual for the student. One ani- mal of each of the more typical genera of each of the families has been figured, and new plates have been added, containing the species not before figured, together with figures and details of some of the smaller species, which were not executed so well as might have been wished in the preceding edition. Wishing to make the work really what its title re- presents it, the species described are restricted to those which appear to be truly native, and only the two fol- towing, viz.— Testacella haliotoidea, t. 3. f. 19., and Driessina polymorpha, have been admitted among those which are ppoeed to have been introduced in modern times. ‘These have been admitted, because they have become truly natu- ralised, and propagate themselves in our climate in the open air. Indeed it is doubtful whether the first of them may not be as truly native as several other species commonly considered so; such as, Helix Pomatia, H. holosericea, H. limbata, H. Carthusiana, and H. Pisana. Several other species were recorded and described in the first edition of this work, which have been introduced with foreign plants, either buried in the mould, or on the plants themselves, or which have most probably been brought to this country in the egg state. These are not truly acclimatised, and only propagate their species when they are kept in stoves or hot-houses; they can therefore have no pretension to be considered as na- tives: among them must be recorded, the