6. Side view of the same specimen, showing below the girdling occipital crest the excavation for the quadrate bone's articulation with the skull, and the forward prolongation of the basi-sphenoid mass. 7. Palatal aspect of the basi-sphenoid bone. =J=._c_.9. To be compared with the small triangular mass in fig. 5, p. 85. 8. Side view of the ethmo-sphenoid mass, =J=._c_.9, showing the lateral boundary of the front of the cerebral hemispheres, p. 85. 9. Posterior aspect of the same specimen, showing parts of the cups which covered the anterior termination of the cerebral lobes. 10. Anterior view of the cerebral lobes in a natural mould of the brain, in the collection of J. F. Walker, Esq. It may be compared with figs. 2. and 9, p. 87. 11. Superior aspect of a natural mould of the brain, showing the outline of the cerebral lobes, and the cerebellum between them behind. Portions of bone in the temporal region are left attached, p. 87. 12. Side view of the same specimen; one cerebral lobe is seen behind the other. The anterior termination of this figure may be compared with the posterior outline of fig. 8. 13. Side view of basi-occipital bone, p. 78. 14. Palatal aspect of quadrate bone, showing the articulation for the lower jaw, and the thin quadrato-jugal attached to its outside, p. 89. 15. Exterior aspect of quadrato-jugal and quadrate bones. Above the articulation in German specimens is the outline of the orbit of the eye. 16. Anterior aspect of the distal end of a left quadrate bone. 17. Posterior aspect of the same specimen, showing the wing for the pterygoid articulation. CRANIUM Pl. 11. [Illustration] PLATE XII. Facial Bones and Lower Jaw. Fig. 1. Side view of the dentary bone of Ornithocheirus machærorhynchus, showing its posterior attenuation towards the palate. =J=._c6_.33.1, p. 113. 2. Superior aspect of the same specimen, showing the palatal groove and tooth sockets. 3. Articular end of left ramus of mandible, =J=._4_, showing its posterior termination, p. 91. 4. Articular end of left ramus of mandible, =J=._c6_.32. 2, fractured through the articulation. 5. Side view of anterior part of dentary bone of Ornithocheirus Cuvieri ? =J=._c_.15, p. 113. 6. Side view of anterior part of premaxillary bone of Ornithocheirus microdon, fractured at both ends. =J=._c_.29, p. 116. 7. Palatal aspect of the same specimen, showing the palatal ridge and tooth sockets.