HOLLAND AND PETERSON: OSTEOLOGY OF THE CHALICOTHEROIDEA. 273 
Catalog No. 1714. 
In this series dorsals two, six, seven, and nine are represented. They belonged 
to a somewhat immature specimen of small size, the posterior epiphyses in all 
cases being wanting and the anterior epiphysis in the sixth vertebra having also 
slipped. 
Catalog No. 1716. 
This consists of dorsals four, five, six, the spine of dorsal seven, and dorsals 
twelve and fifteen. With the exception of dorsals five, twelve, and fifteen the 
specimens are somewhat injured. They represent a mature individual of small 
size, undoubtedly belonging to Moropus petersoni. 
Catalog No. 1716. 
Consists of the second dorsal of an individual of medium size. 
Catalog No. 1717. 
This is the second dorsal vertebra of a young individual of small size, the spine 
and transverse processes being well preserved but both the anterior and posterior 
epiphyses of the centrum having been lost. 
Catalog No. 1718. 
This is a somewhat injured specimen of the first dorsal of a young individual 
of medium size which has lost the anterior and posterior epiphyses of the centrum. 
Catalog No. 1719. 
This is a remarkably well preserved first dorsal of a medium sized individual, 
which has sustained no injury whatever. 
Catalog No. 1731. 
Consists of the centra of dorsals eight, nine, and ten. The centra are well 
preserved and represent a large and mature individual. The neural arches and 
the spines have, however, been completely lost from these three specimens. 
The First Dorsal Vertebra. 
This vertebra is represented in the collection by five specimens. In the 
mounted specimen, No. 1604, unfortunately only the centrum of this bone remained 
and that in a damaged condition, but showing enough to enable its antero-posterior 
diameter to be ascertained. The specimens catalogued as Nos. 1703B, 1712, 1718, 
and 1719 supplied the outline of the missing portions, although all are smaller than 
