The Ornithosauria / An elementary study of the bones of Pterodactyles made from fossil remains found in the Cambridge Upper Greensand, and arranged in the Woodwardian Museum of the University of Cambridge

by H. G. Seeley

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.

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.