Manual of Conchology, Structural and Systemic: With Illustrations (Classic Reprint) - Tapa blanda

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Excerpt from Manual of Conchology, Structural and Systemic: With Illustrations

The Scaphopoda have hitherto received comparatively little at tention from either conchological or morphological naturalists. No other molluscan group of like rank and extent exists upon which the anatomical data are so scanty, or restricted to so small a num ber of species; and as the Class consists mainly of deep sea dwellers, the list of species now known is doubtless a mere fraction of the grand total of living forms.

Consonant with the general plan of the Manual, this volume treats primarily of the system of Scaphopods, and the determina tion of genera and species. A classification of the Dentaliidae based upon features hitherto untried for this purpose is submitted; and the innovation is made of including a catalogue of fossil species, largely with a view to rectify the current nomenclature and prevent future complications by the duplication of specific names. The labor of collating the references to fossil forms has been, in large measure, accomplished by Dr. Benj. Sharp.

The work is based upon the collection of the Academy of Natural Sciences, containing a large proportion of known shore species, and upon that of the United States National Museum, including the types of dall, J arrears, verrill and gould.

This great collection, undoubtedly richer than any other in exist ence in deep sea forms, was, with generosity rarely equalled, placed at my disposal by Prof. William H. Dall, Honorary Curator, and the authorities of the Museum. My most earnest thanks are due to them for this and other courtesies.

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