Seen from above, the skull is narrow, as stated by Marsh; but, contrary to his statement, there is not a sharp ridge extending along the upper border. This border is obtuse and rounded, and in the frontal region, flattened. The sagittal crest is large, but not nearly so large as it is figured by Marsh, the restored outline of whose figure is undoubtedly wrong. The texture of the bone forming the crest is materially different from that of the remaining bones of the skull. The bone is more roughened, and less firm. There is a well-developed ring of sclerotic ossifications. In the specimen figured, the separate plates measure from six to eight millimeters in diameter. They were not imbricated, as in the Pythonomorpha, but have a similar dense texture. There is a superior temporal arch, bridging over a small opening leading downward to the inferior temporal fossa. The following measurements will give the principal dimensions of this specimen. Length from tip of premaxillary to occipital condyle 680 millim. Extreme length of skull 780 Extent of crest beyond orbit 145 Greatest diameter of orbit 65 Antero-posterior diameter of nasal opening 135 Length of quadrate 120 Width of lower jaw at articulation 22 =Pubis.= In a previous paper on the anatomy of _Pteranodon_,[2] I stated that I had never seen the so-called “prepubic bones.” Since that time, however, an excellent specimen of them has been discovered among our material. The specimen of which they are a part consists of the larger portion of the skeleton, and is perhaps conspecific with the one to which the described pelvis belongs. The figure given herewith will convey a good idea of their shape. The bones of the two sides are firmly co-ossified, and have been pressed nearly flat; the figure represents them as they are spread out in one plane. The bone is very thin throughout, with a slight thickening at the ischial (_a_) attachment only. Lying contiguous with the anterior projection, is a slender ventral rib (_b_). It is possible that the curvature of this bone may be inward, rather than outward. [Illustration: FIG. 1.] [2] Amer. Naturalist, Dec. 1891, p. 1124. In this article the description of the foot-phalanges should read: “All are slender, except the second one in the third toe, and the second and third in the fourth toe, where they are scarcely longer than wide.” This peculiar structure of the pubis (I believe it represents the pubis, and not the prepubis), seems to be quite similar to that which obtains in the genus _Rhamphorhynchus_, and, perhaps also, in _Pterodactylus suevicus_ (_Cycnorhamphus_ Seeley), and very different from that found in other species of _Pterodactylus_. The principal measurements of the above described specimen are as follows: