Monograph of the Palaeontographical Society . 2. Euomphalus Permianus, Zif;?^. Thrice the natural size ; testiferous. Tun-stall Hill. 13. Nautilus Frieislebeni, Geinitz. Cast (natural size) showing external face of the outer whorl. Humbleton Hill. 14. — — Lateral view of the last specimen : a, the siphonal sheath. 15. — — Inner tace of the outer whorl of the same : a, the siphonal sheath. 16. — — Longitudinal section (enlarged) of a testiferous specimen, showing the siphonal sheath {a) passing through thesepta. Humbleton Hill. 17. Nautilus Bowerbankianus, King. Lateral aspect (natural size) of
Monograph of the Palaeontographical Society . 2. Euomphalus Permianus, Zif;?^. Thrice the natural size ; testiferous. Tun-stall Hill. 13. Nautilus Frieislebeni, Geinitz. Cast (natural size) showing external face of the outer whorl. Humbleton Hill. 14. — — Lateral view of the last specimen : a, the siphonal sheath. 15. — — Inner tace of the outer whorl of the same : a, the siphonal sheath. 16. — — Longitudinal section (enlarged) of a testiferous specimen, showing the siphonal sheath {a) passing through thesepta. Humbleton Hill. 17. Nautilus Bowerbankianus, King. Lateral aspect (natural size) of a testiferous specimen. Tunstall Hill. 18. — — Posterior aspect of the last specimen. 19. — — Anterior aspect of the same. 20. — — Nucleal whorls (twice the natural size) showing a septum perforated by the siphonal sheath («). Tunstall Hill. 21. Bairdia curta, J/Cby. Cast; magnified nine times. Dorsal aspect; valves united. Humbleton Hill. 22. — — Lateral aspect of the same specimen; right valve upwards.
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectpaleontology, bookyea
