10. Cervical vertebra seen from the left side. =J=._c6_.27.1, no. 4. 11. Cervical vertebra of another genus seen from the left side. =J=._c_.2, no. 13. 12. Base of the centrum of the last true cervical vertebra. =J=._c_.2, no. 40. 13. Right side of cervical vertebra. =J=._c_.2, no. 7. NECK VERTEBRÆ Pl. 9. [Illustration] PLATE X. Back and Tail Vertebræ. Fig. 1. Centrum of a vertebra from the region between the neck and the back, called pectoral. =J=._c_.3, no. 19, p. 69. 2. Dorsal vertebra seen from below. =J=._c2_.12.3, no. 2. 3. The same specimen seen from behind. 4. Right side view of a dorsal vertebra showing the neural spine nearly perfect. =J=._c_.3, no. 20. 5. The same specimen seen from behind. 6. Right side of dorsal vertebra showing anterior and posterior zygapophyses. The neural spine broken. 7. Front view of the same specimen. The centrum is seen to form but a small part of the anterior articular surface. ------------------ 8. Bight side of a sacral vertebra =J=._c_.4, no. 1, p. 73. 9. Front aspect of the same specimen. The neural arch forms part of the intervertebral articulation with the centrum. 10. Side view of the anterior part of a sacrum, presented by H. C. Raban Esq. =J=._c_.4, no. 3. 11. The same specimen seen from below. 12. Inferior aspect of posterior part of sacrum of a different genus. =J=._c_.4, no. 2. ------------------ 13. Large caudal vertebra seen from above. =J=._c_.5, no. 9. 14. The same specimen seen from beneath, p. 75. 15. Left side of the same specimen. 16. Anterior articulation of the same specimen. 17. Posterior aspect of the same specimen. BACK & TAIL VERTEBRÆ Pl. 10. [Illustration] PLATE XI. Cranium. Fig. 1. Occipital aspect of the skull of a Pterosaurian. =J=._c_.8, no. 2, p. 84. 2. Anterior aspect of the same skull, showing a transverse section of the brain cavity fractured through the parietal bones. At its base on each side are seen the optic lobes. 3. Anterior aspect of a Pterodactyle skull of a different genus. =J=._c_.8, no. 1. The frontal bones have come away from the parietal at the suture, p. 80. 4. Superior aspect of the same specimen looking upon the parietal, supra-occipital, and ex-occipital bones. 5. Occipital aspect of the same specimen, showing the foramen magnum, the absence of the basi-occipital bone, and the basi-sphenoid mass.