Bulletins of American paleontology . Bull. Amer. Paleont., Vol. 56 Plate 48. Cymatiid Gastropods: Smith 567 Explanation of Plate 48Figure Page 1,2. Mediargo mathewsonii (Gabb) 507 IGPS 2677a. Miocene, Fukiishima Prefecture, Japan. Aper-tural, abapertural views; ( cm high). [Paratype of Bursayabci Nomura and Hatai.]3. Mediargo mathewsonii (Gabb) 507 LSJU 284. Oligocene, Vancouver Island, British view; ( cm high). [Paratype of Bursa van-cou-vcrcnsis Clark and Arnold.]4,5. Mediargo mathewsonii (Gabb) 507 IGPS 71196. Miocene, Yamagata Prefecture, Japan. Abaper-tural, aper


Bulletins of American paleontology . Bull. Amer. Paleont., Vol. 56 Plate 48. Cymatiid Gastropods: Smith 567 Explanation of Plate 48Figure Page 1,2. Mediargo mathewsonii (Gabb) 507 IGPS 2677a. Miocene, Fukiishima Prefecture, Japan. Aper-tural, abapertural views; ( cm high). [Paratype of Bursayabci Nomura and Hatai.]3. Mediargo mathewsonii (Gabb) 507 LSJU 284. Oligocene, Vancouver Island, British view; ( cm high). [Paratype of Bursa van-cou-vcrcnsis Clark and Arnold.]4,5. Mediargo mathewsonii (Gabb) 507 IGPS 71196. Miocene, Yamagata Prefecture, Japan. Abaper-tural, apertural views; ( cm high). [Paratype of Apollonsazanami Hatai and Kotaka.]6,7. Mediargo mathewsonii (Gabb) 507 IGPS 77795. Miocene, Yamagata Prefecture, Japan. Abaper-tural views; (4 cm high). [Holotype of Apollon sazanamiHatai and Kotaka.]8,9. Mediargo mathewsonii (Gabb) 507 IGPS 2677b. Miocene, Fukushima Prefecture, Japan. Aper-tural, abapertural views: ( cm high). [Holotype of Bursayabci Nomura and Hatai.]10,11. Mediargo mathewsonii (Gabb) 507 IGPS 74317. Lower Mio


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