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Abstract |
The collignoniceratid ammonites from the Cretaceous of Hokkaido are monographed. Part I contains the introductory remarks and the systematic descriptions of the subfamily Collignoniceratinae, with som...e revision of genera. One species of Collignoniceras, two new species of Prionocyclus, one new species and two others of Prionocycloceras, one new species of Subprionotropis, four species of Subprionocyclus, one new species probably referred to Niceforoceras and a new species under a new genus are described. Reesidites minimus is clearly redescribed. In comparison with the species from Hokkaido remarks are given on sorne species occurring outside Japan.show more
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Table of Contents |
1.Introduction 2.Systematic Descriptions 3.Bibliography
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