. Bulletin of the British Museum (Natural History), Geology. Fig. 16 Cretaceous Mesoglauconia and Cassiopella species from Japan. All specimens in the colln of National Science Museum, Tokyo. 1, 2, from Kawaguchi Formation, Yatsushiro area, Japan. 1, M. neumayri (Nagao, 1927), Hauterivian-Barremian. PM 15112, x 1-5. 2, M. angusta (Kobayashi & Suzuki, 1939), Barremian. PM 15193, xl-4. 3, 4, from Sebayashi Formation. 3, M. sebayashiensis (Kase, 1984), Aptian, from Sanchu area, Japan. Note wide sinus in growth lines characteristic of Mesoglauconia. PM 15122, x 1. 4, Cassiopella ogai
. Bulletin of the British Museum (Natural History), Geology. Fig. 16 Cretaceous Mesoglauconia and Cassiopella species from Japan. All specimens in the colln of National Science Museum, Tokyo. 1, 2, from Kawaguchi Formation, Yatsushiro area, Japan. 1, M. neumayri (Nagao, 1927), Hauterivian-Barremian. PM 15112, x 1-5. 2, M. angusta (Kobayashi & Suzuki, 1939), Barremian. PM 15193, xl-4. 3, 4, from Sebayashi Formation. 3, M. sebayashiensis (Kase, 1984), Aptian, from Sanchu area, Japan. Note wide sinus in growth lines characteristic of Mesoglauconia. PM 15122, x 1. 4, Cassiopella ogaii Kase, 1984, replica of holotype from Sebayashi, Japan. Note slight notch in aperture and columella snout. PM 15234, x Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). London : BM(NH)
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