. Bulletins of American paleontology. 205 Ai^\ Ordovician Cli''ods: Teichert i^ Glenister 59 1937, Init its diagnosis was based on erroneous descriptions of the type genus, mainly by Ruedemann. Flower (1946) restudied Protero- cameroceras, showing that it was orthochoanitic and characterized by split septal necks and complex connecting rings. He established the family, Proterocameroceratidae. However, although it was Flower who first demonstrated the true structure of the type genus, the family name must be credited to Kobayashi. The grouping of genera in this family is not satis
. Bulletins of American paleontology. 205 Ai^\ Ordovician Cli''ods: Teichert i^ Glenister 59 1937, Init its diagnosis was based on erroneous descriptions of the type genus, mainly by Ruedemann. Flower (1946) restudied Protero- cameroceras, showing that it was orthochoanitic and characterized by split septal necks and complex connecting rings. He established the family, Proterocameroceratidae. However, although it was Flower who first demonstrated the true structure of the type genus, the family name must be credited to Kobayashi. The grouping of genera in this family is not satisfactory. Flower and Kummel (1950) include forms with septal necks ranging in length from vestigial to nearly the length of the camera. Some of the genera included by them are known only from isolated siphuncles (Utoceras, Oderoceras) and the length of their septal necks is not known. We are placing here the new genus Anthoceras. It is an annu- late form, being the earliest annulate endoceratid so far known. The structures of the septal necks and connecting rings in Anthoceras are so different from those of Proterocameroceras that there is justifiable doubt of particularly close relationships between the two genera. Genus rKOTEKOCAJIEROCERAS Ruedemann, 1905 Proterocameroceras coiitrarhim Teichert and Glenister, PI. 4, figs. 1-4; text figs. 10-11. Fig. 10. Ectosiphuncle of Proterocameroceras 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 Paleontological Research Institution (Ithaca, N. Y. ); Columbia University. Ithaca, N. Y. , Paleontological Research Institution [etc. ]
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