| Abstract/Notes | The following notes were compiled, for the most part, some years ago, but their publication in the present form suggested itself to the writer on the perusal (during a short “leave” from active service) of a number of recent papers ou Ammonites, principally Professor Swinnerton and A. E. Trueman's study of the “Morphology and Development of the Ammonite Septum”. The main part of that inquiry is devoted to the development of the septum, illustrated by successive “septal sections”, and it is claimed that where sutural development cannot be worked out, “septal sections” will to some extent serve as a substitute. The writer lias no intention of discussing the usefulness of “septal sections”; but some of the suggestions put forward, and conclusions arrived at, by the authors, as well as certain opinions, whicli they adopt from other workers on Ammonites, invite critical examination. Since, in the present paper, other recent work on the morphology and physiology of the Ammonite septum and suture-line, not yet embodied in textbooks, is also included, and since the writer ventures to put forward opinions that differ in many essentials from the views of both textbooks and other authors, it is hoped that the paper may prove of general interest. |
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