on the ornamentation and structure of the septa comprising their shells' gas chambers.

Taxonomy of the Treatise on Invertebrate Paleontology

The Treatise on Invertebrate Paleontology (Part L, 1957) divides the Ammonoidea, regarded simply as an order, into eight suborders, the Anarcestina, Clymeniina, Goniatitina and Prolecanitina from the Paleozoic; the Ceratitina from

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