. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 218 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY start from the basic structures of the earliest ammonoids, the undifferentiated goniatites. Wedekind has wisely avoided these two mistakes and has estab- lished a terminology unsurpassed until now in consistency and simplicity. I have further elaborated the principles introduced by him, and in this paper I shall discuss in a summary form some general questions concerning the suture line and certain related topics. Agoniatites Mimagoniat.. Oyroceratites Lobobactrites Bactrite

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. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 218 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY start from the basic structures of the earliest ammonoids, the undifferentiated goniatites. Wedekind has wisely avoided these two mistakes and has estab- lished a terminology unsurpassed until now in consistency and simplicity. I have further elaborated the principles introduced by him, and in this paper I shall discuss in a summary form some general questions concerning the suture line and certain related topics. Agoniatites Mimagoniat.. Oyroceratites Lobobactrites Bactrites Fig. 1. Suture lines (partly adolescent and adult) and shell shapes of the earliest representatives of goniatites. (Adapted from Schindewolf 1933.) ACKNOWLEDGMENTS The writer is deeply indebted to the Geological Society of America for a very generous invitation to attend its 1953 Annual Meeting at Toronto. This gave him the welcome opportunity to deliver this lecture in the symposium of the Paleontological. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum