Measurements.
(TEETH, LOWER JAW.)
| M. | |
| Transverse diameter of last molar | ·026 |
| Height of highest point above cingulum of last molar | ·023 |
| Fore-and-aft diameter of second molar | ·0285 |
| Transverse diameter of second molar | ·023 |
| Height of second molar | ·0215 |
| Length of fourth premolar | ·021 |
| Width of fourth premolar | ·015 |
| Height of fourth premolar | ·020 |
| Length of third premolar | ·020 |
| Width of third premolar | ·015 |
| Height of third premolar | ·014 |
Vertebræ.
Cervical region ([Plate VI.], Fig. 1).—(Only one preserved, probably fifth or sixth.)
The centrum is short, compared with the dorsals, but is much longer than the cervical centra of the Proboscidea; it is broad and depressed, oval in form, and slightly opisthocœlous. The zygapophyses are developed upon tuberous projections of the pedicles; they are large, flat, and in the same plane with each other. The diapophyses are very slender and short, and but slightly heavier than the parapophyses, with which they unite, enclosing a large vertebraterial canal. At the anterior margin of the parapophysis, a small pointed process projects downward.
The pedicles are low and very heavy, bounding a narrow neural canal.
The epiphyses are not so completely ossified as they are in the dorsal region.
Dorso-lumbar region ([Plate VI.], Figs. 2, 3, 4, 5),—(Description based upon nine dorsals and two lumbar vertebræ.)
The centra are large, subtriangular, and slightly compressed; they are opisthocœlous, but less so than in the Proboscidea. They increase in size slowly but regularly from before backwards. In the middle dorsal region they are excessively expanded laterally for the posterior-costal attachments; but become less broad and higher as they recede in the series. In the middle of the series the centra are marked by a prominent hypophysial keel.