745. A NEW NAUTILOID SPECIES FROM THE UPPER CRETACEOUS IZUMI GROUP OF SHIKOKU

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  • 745. 四国の上部白亜系和泉層群から産出したオウムガイ類化石 (新種)
  • 四国の上部白亜系和泉層群から産出したオウムガイ類化石(新種)〔英文〕
  • シコク ノ ジョウブ ハクアケイ イズミソウグン カラ サンシュツシタ オウム

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Abstract

A specimen from the Upper Cretaceous Izumi Group of the Sanuki Mountains, Shikoku, is described as representing a new species of Eutrephoceras. This is clearly different from E. dekay (Morton), the type-species from the North American Atlantic Coast. But in the sutural pattern and shell form it possibly resembles E. neubergicum (Redtenbacher) from the Upper Cretaceous of Europe and is somewhat similar to E. cookanum (Whitfield) from the Lower Tertiary of North America. It is suggested that some characters of Nautilus, e.g. the less inflation of flanks and the slightly sinuous suture, are foreshadowed in this species.

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