The inferior faces of the centra are slightly concave in the first three. The first and fourth have slight hypophysial keels.
The neural canal is very wide and depressed in the first, but decreases rapidly backwards, becoming extremely small in the last.
Caudal region ([Plate VI.], Fig. 6).—(Description based upon the first four.)
The centra of the caudal vertebræ are rather long, narrow, and greatly depressed in the middle; they decrease in size gradually backward. The pedicles and laminæ are short and thin, enclosing a small neural canal. The neural spines point directly back, being almost parallel with the axis of the centrum. They are slender and tuberous at the extremity. The transverse processes are very long, wide, and thin, thickened somewhat at the ends, and project directly out; they decrease in size backwards. From the persistence of the neural canal, and from its comparative size, it would seem as if the tail was considerably larger than that of the elephant.
Measurements of Vertebræ.
Cervical region ([Plate VI.], Fig. 11).
| M. | |
| Diameter of cervical (vertical) | ·079 |
| Diameter of cervical (transverse) | ·111 |
| Diameter of cervical (fore-and-aft) | ·051 |
| Extreme length of prolongation of pedicles for zygapophyses | ·089 |
| Long diameter of vertebraterial canal | ·040 |
| Width of pedicles | ·035 |
Dorsal region ([Plate VI.], Figs. 2 and 3).
| M. | |
| In anterior region: Diameter of centrum (fore-and-aft) | ·075 |
| Diameter of centrum (vertical) | ·062 |
| Diameter of centrum (transverse) | ·142 |
| In posterior region ([Plate VI.], Fig. 3).: Diameter of last dorsal (vertical) | ·087 |
| Diameter of last dorsal (transverse) | ·110 |
| Average width throughout the series of neural canal | ·097 |
| Width of transverse process (anterior dorsal) (Fig. 2, [Plate VI.]) | ·075 |
| Length of lamina from prezygs. to post-prezygs. (Fig. 2, [Plate VI.].) | ·12 |
| Length of transverse process (middle dorsal). (Fig. 3, [Plate VI.]) | ·055 |
| Vertical length of anterior dorsal from tip of spine to hypapophysial keel | ·183 |
| Width between inner margins of metapophyses (last dorsal) | ·172 |