In different individuals, the lower jaw varies greatly in height, but this seems to me to be individual and sex variation. The three incisors and the canine are subequal in size, closely crowded, and each with a small cingulum near the base of the enamel. MEASUREMENTS OF SKULL, SPECIMEN 3191 Skull, length from front of nasal to back of lambdoidal crest 211 mm. Skull, width across zygomatic arches 172 mm. Skull, width across postorbital processes 78 mm. Skull, height above molar 2 84 mm. Dentition, from upper inc. 1 to molar 3 140 mm. Dentition, from lower inc. 1 to molar 3 136 mm. Mandible, height under molar 2 35 mm. Mandible, height under the articulation 118 mm. The atlas and axis are wanting, and the characteristics of the other cervicals have been given under the generic description. MEASUREMENTS, SPECIMEN NO. 3291. Cervical 3, length of centrum 18 mm. Cervical 5, length of centrum 18 mm. Cervical 6, length of centrum 21 mm. Cervical 6, height from base of centrum to top of spine 74 mm. Cervical 7, length of centrum 21 mm. Cervical 7, height from base of centrum to top of spine 55 mm. [Illustration: Fig. 56. Cervicals. 5, 6 and 7—½ natural size.] [Illustration: Fig. 57. Dorsal 6 and 7—½ natural size.] The first three or four of the thoracic vertebrae are represented only by their neural arches and spines. There were at least fifteen in the series, for I have that number represented, but more probably the number was sixteen as in the case in _Adinotherium_. Typical vertebrae measure: SPECIMEN 3291 Thoracic 3, length of centrum 21 mm. Thoracic 3, height from base of centrum to spine 56 mm. Thoracic 6, length of centrum 22 mm. Thoracic 6, height from base of centrum to spine 79 mm. Thoracic 14, length of centrum 26 mm. Thoracic 14, height from base of centrum to spine 65 mm. In my series, there are six lumbars, which is one more than is credited to _Adinotherium_, though in that genus the number has not been definitely fixed. Typical lumbars measure as follows: Lumbar 2, length of centrum 29 mm. Lumbar 2, height from base of centrum to spine 65 mm. Lumbar 4, length of centrum 31 mm. Lumbar 4, height from base of centrum to spine 57 mm. There is nothing to represent the sacrum or caudals. Only the lower half of the humerus is preserved and that with specimen 3191, and it measures: