Abstract.  Two genera of Permian ammonoid Popanoceratidae are described from the South Kitakami
Belt, Northeast Japan: Tauroceras from the upperrmost part of the Hosoo Formation in the Southern
Kitakami  Massif, and Popanoceras and Tauroceras, associated with Jilingites ?, Waagenoceras and
Agathiceras, from the upper part of the Takakurayama Formation in the Eastern marginal part of the
Abukurna Massif.  These amrnonoid specimens are considered in situ occurrences and strongly suggest
that these fossil horizons are both Wordian in age.