Fossil whale barnacles (Balanomorpha: Coronulidae) deposited in the Mizunami Fossil Museum, are classified. Seven species in three genera of whale barnacles from the Pliocene–Pleistocene deposits of Japan are recorded and illustrated. Cetopirus complanatus (Mörch) from the Middle Pleistocene, Coronula reginae Darwin from the Lower Pleistocene (Calabrian), and Cryptolepas rachianecti Dall from the Lower Pleistocene (Gelasian) are first reported in the Japanese fossil records. Coronula Lamarck comprises five species, C. barbara Darwin from the Lower Pleistocene, C. bifida Bronn from the Lower Pliocene–Lower Pleistocene (Gelasian), C. diadema (Linnaeus) from the Lower Pleistocene (Calabrian)–Middle Pleistocene, C. reginae from the Lower Pleistocene (Calabrian), and C. sp. from the Middle Pleistocene. A compartment of an undetermined coronulid genus and species from the Lower Pleistocene (Gelasian) compared with that of Tubicinella major Lamarck and Cetolepas hertleini Zullo is also described.

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Seven species of decapod crustaceans were described from the Miocene Itsukaichimachi Group based mainly upon examinations of the museum collection. Decapod fossils are stratigraphically limited to the Kosho and Tateya formations and characterized by the predominance of Callianopsis titaensis (Nagao, 1941). Five and two additional species were obtained from these formations, respectively. Trichopeltarion ryouheii, Kato n. sp. and Carcinoplax antiqua (Ristori, 1889) are the first recognized decapod species common to the adjacent Miocene Chichibu Basin in Saitama Prefecture.

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