. Bulletin of the British Museum (Natural History), Geology. CASSIOPIDAE 269 (1984) described them as separate species of Cassiope on the basis of their shell morphology and apertural features, and their occurrence at different stratigraphical horizons. The ornament of C. sebayashiensis Kase is composed of closely-packed, fine, wavy secondary spirals and smooth. 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-B
. Bulletin of the British Museum (Natural History), Geology. CASSIOPIDAE 269 (1984) described them as separate species of Cassiope on the basis of their shell morphology and apertural features, and their occurrence at different stratigraphical horizons. The ornament of C. sebayashiensis Kase is composed of closely-packed, fine, wavy secondary spirals and smooth. 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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