which the characters of the genus are noted. Other drawings give the technical terms that are used in the diagnosis of shells. The keys and the explanatory notes of their use take up 81 pages. Following this there is a systematic list which gives a classification of the groups down to genera. Under a section entitled "Ecology," the genera are arranged alphabetically, and the approximate number of species in each genus, its range, and its habitat is briefly noted. The glossary contains most of the technical terms used in discussing molluscan shells but not anatomy. There is a short bibliography and an excellent index of scientific names.The difficulties encountered in constructing a key to so large a group as the Gastropoda are almost insuperable; only the brave would attempt it, and only the most tenacious would complete the task. This is especially true with respect to those genera that have a multiplicity of subdivisions which are based upon more or less trivial characters. The author undoubtedly encountered many cases where a choice of diagnostic characters of the shells was difficult. By bringing the nomenclature up to date and furnishing adequate illustrations, together with distinguishing characters of each genus, Myra Keen has provided a unique handbook that will long remain the standard reference for the area. Professional conchologists, individuals engaged in commercial shell fish investigations, and amateurs alike will find it indispensable.It is the first book of its kind for the area concerned, and it covers all of the shell-bearing mollusks. It may well serve as a model for handbooks covering other areas.
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