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Part Ⅱcontains the systematic descriptions of the subfamily Peroniceratinae. In addition to Peroniceras, Gauthiericeras (s.s.), G. (Cyryellaa) and Reginaites, four new genera are established, with muc...h revision of the previously established genera. The relations of these genera and the origin of the subfamily are discussed on the basis of the author’ s observations. The described species from Hokkaido are altogether ten :―three of Peroniceras, a new one and another of the first new genus, two new ones and another of the second new genus, a new one of the third and the fourth new genus respectively. In connection with the descriptions of the species from Hokkaido, comments are given on some species occurring outside Japan.続きを見る
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Systematic Descriptions(continued)
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