. Annals of the Carnegie Museum. Carnegie Museum; Carnegie Museum of Natural History; Natural history. 90 Annals of the Carnegie Museum. Between the origin of the transverse process and the ventral keel there is located on the centrum a deep pit, which is apparently more emphasized than in Poebrotherinm. As in the latter, the vertebrarterial canal extends throughout the entire length of the side of the neural canal, and is plainly visible from the side, entirely unlike what is ob- served in the tylopods, and more like the condition found in the Bovidcc. The sixth and seventh cervicals are so b
. Annals of the Carnegie Museum. Carnegie Museum; Carnegie Museum of Natural History; Natural history. 90 Annals of the Carnegie Museum. Between the origin of the transverse process and the ventral keel there is located on the centrum a deep pit, which is apparently more emphasized than in Poebrotherinm. As in the latter, the vertebrarterial canal extends throughout the entire length of the side of the neural canal, and is plainly visible from the side, entirely unlike what is ob- served in the tylopods, and more like the condition found in the Bovidcc. The sixth and seventh cervicals are so badly mutilated that an accurate description of them is not possible. No dorsals are present, and there are only four posterior lumbars represented. The two vertebrae anterior to the last (the fifth and sixth) have the cen- tra quite long, with prominent ventral keels, and also well developed neural spines. The last lumbar, as usual, has a shorter and more depressed centrum. So far as compari- son is possible, these parts agree well with the description and illustration by Wort- man {, p. 107). This individual also presents for the first time the complete metacarpals III and IV, the proximal end only of Mc. II is preserved, while Mc. V is lost. As Professor Scott has shown (, p. 36) the metacarpals are rela- tively short and otherwise differ from those in Poebrotherinm. An illustration is here- with gi\en of the metacarpals and the metatarsals (See Fig. 14). Both hind feet are represented and the most curious feature is the characteristic bovine coossification of the cuboid and the navicular in the tarsus of both feet, which is hard to believe to be anything but purely pathological, especially since the entocunei- form of the right tarsus also has a tendency to become coossified with the cuboid.^" In another specimen (No. 2977) of slightly larger size and also fully adult, or old, both hind feet are preserved,. Fig. 14. Proiylopus pcler- soni. Carnegie Museum No. 29
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