785. HEMIASTERID ECHINOIDS FROM THE UPPER CRETACEOUS OF JAPAN

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  • 785. 日本産白亜紀後期 Hemiaster 類のウニ化石
  • 日本産白亜紀後期Hemiaster類のウニ化石〔英文〕
  • ニホンサン ハクアキ コウキHemiasterルイ ノ ウニ カセキ エイブン

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In this paper selected eight species of Hemiaster from the Upper Cretaceous of Japan are described. They are assigned to the subgenera Hemiaster (5 species), Leymeriaster (2 species) and Mecaster (1 species). Among them, one is new, another is a hitherto described Japanese species, and some of the rest are provisionally comparable with but distinct from certain foreign species, but I postpone to establish new taxa until more and better material is obtained. Some brief remarks are given on the Hemiaster faunal aspect, the mode of occurrence and the inferred mode of life.

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