M. Diameter of centrum (fore-and-aft) ·095 Diameter of posterior face (transverse) ·111 Diameter of posterior face (vertical) ·078 Extreme width between transverse processes ·214 Width between pre-zygapophyses ·110 Length of neural spine from lamina ·060 Vertical length from tip of spine to lower side of centrum ·194 _Sacral region._ M. Length of sacral series ·264 Transverse extent of sacral series ·298 Diameter of first vertebra at free end (transverse) ·109 Diameter of first vertebra at free end (vertical) ·072 Diameter of first vertebra at free end (tore and aft) ·070 Diameter of last vertebra at free end (transverse) ·053 Diameter of last vertebra at free end (vertical) ·031 Diameter of neural canal at first vertebra (transverse) ·100 Diameter of neural canal at last vertebra (vertical) ·018 Long diameter of first transverse foramen (internal side) ·076 _Caudal region_ (Fig. 6, Plate VI.). M. Length of first four ·252 Diameter of centrum, first (fore-and-aft) ·061 Diameter of neural canal of first (transverse) ·035 Extent of transverse process in first ·085 Extent of transverse process in fourth ·046 Fore-and-aft width of transverse process of first in the middle ·048 _Ribs._--Description based upon two perfect ones, and parts of four more. The ribs, as in _Dinoceras_, "resemble very much those of the Mastodon." The capitulum has two convex facets, separated by a narrow groove. The sternal end in one is very much expanded, but less so in the other. The tubercle is small, and is situated upon the prolongation of the lamelliform process for the intercostal muscles. The angle is much sharper than in the corresponding ribs of _Mastodon_. _Measurements of Ribs._ M. Length of rib without curvature ·571 Length of rib with curvature ·739 Width of rib just below head ·049 Width at muscular attachment ·063 Vertical diameter of larger facet of capitulum ·039 _Scapula_ (Plate VIII., Fig. 1).--The scapula is subtriangular, with the pre-scapular border as base, and the apex half way up the postscapular.