Monograph of the Palaeontographical Society . (:., ./„ PLATE X. Fig- 1. Cleiothyris pectinifera, /. de C. Sowerhy. Umbonal view (natural size) of a tes- tiferous specimen. Tynemouth Cliff. 2. , — — Large valve of last specimen, showing the pectinated expansions. 3. — — Small valve of the same, showing the emarginate foramen {a). 4. — — Lateral view of the same, showing the pectinated ex- pansions. 5. — — Cast of large valve, natural size. Humbleton Hill. 6. — — Umbonal view of the last specimen. 7. — — Magnified view of the pectinated expansions. 8. — — Enlarged view of the inside
Monograph of the Palaeontographical Society . (:., ./„ PLATE X. Fig- 1. Cleiothyris pectinifera, /. de C. Sowerhy. Umbonal view (natural size) of a tes- tiferous specimen. Tynemouth Cliff. 2. , — — Large valve of last specimen, showing the pectinated expansions. 3. — — Small valve of the same, showing the emarginate foramen {a). 4. — — Lateral view of the same, showing the pectinated ex- pansions. 5. — — Cast of large valve, natural size. Humbleton Hill. 6. — — Umbonal view of the last specimen. 7. — — Magnified view of the pectinated expansions. 8. — — Enlarged view of the inside of the posterior half, showing the hinge-structures of both valves : a, dental plates ;3, foramen in the crural base or platform ; e, teeth ;/, dental sockets. Humbleton Hill. 9. — — Enlarged view of the hinge-structures of the small valve : a, crural base or platform ; b, foramen in do. ; c, buttonor cardinal muscular fulcrum; d, origins of the cruraof the spirals. 10. — — Enlarged view of one of the sp
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectpaleontology, bookyea
