Chapter I: Preface: To the First Edition

The term “_Malacology_,” an abbreviation of “_Malacozoology_,” from the Greek μαλακος, _soft_, ζωον, _an animal_, and λογος, _a discourse_, was first employed by the French naturalist De Blainville to designate an important division of Natural History, in which the leading feature of the animals discussed was the _softness_ of the flesh, or, to speak with greater accuracy, of the general envelop. This division comprehends not only the _Mollusca_, but also the _Testacea_ of Aristotle and of Pliny, and, of course, had reference to molluscous animals in general—of which the greater portion have shells.

A treatise concerning the shells, exclusively, of this greater portion, is termed, in accordance with general usage, a Treatise upon Conchology or Conchyliology; although the word is somewhat improperly applied, as the Greek _conchylion_, from which it is derived, embraces in its signification both the animal and shell. Ostracology would have been more definite.

The common works upon this subject, however, will appear to every person of science very essentially defective, inasmuch as the _relation_ of the animal and shell, with their dependence upon each other, is a radically important consideration in the examination of either. Neither, in the attempt to obviate this difficulty, is a work upon Malacology at large necessarily included. Shells, it is true, form, and, for many obvious reasons, will continue to form, the subject of chief interest, whether with regard to the school or the cabinet; still there is no good reason why a book upon _Conchology_ (using the common term) may not be malacological as far as it proceeds.

In this view of the subject the present little work is offered to the public. Beyond the ruling feature—that of giving an anatomical account of each animal, together with a description of the shell which it inhabits,—I have aimed at little more than accuracy and simplicity, as far as the latter quality can be thought consistent with the rigid exactions of science.

No attention has been given to the mere _History_ of the subject; it is conceived that any disquisition on this head would more properly appertain to works of ultimate research, than to one whose sole intention is to make the pupil acquainted, in as tangible a form as possible, with _results_. To afford, at a cheap rate, a concise, yet sufficiently comprehensive, and especially a well illustrated school-book, has been the principal design.

In conclusion, I have only to acknowledge my great indebtedness to the valuable public labors, as well as private assistance, of Mr. Isaac Lea, of Philadelphia. To Mr. Thomas Wyatt, and his late excellent _Manual of Conchology_, I am also under many obligations. No better work, perhaps, could be put into the hands of the student as a secondary text book. Its beautiful and perfectly well-coloured illustrations afford an aid in the collection of a cabinet scarcely to be met with elsewhere.

E. A. P.