PETERSON: A REVISION OF THE ENTELODONTID A 103 
ess of collecting.” The neural spines are, however, restored from another specimen 
(No. 2193B) collected in the Agate Spring Quarries (Quarry No. 1) in 1908 and 
their shape (see Plates LX, LXI) is thought to be nearly correct. The centra in 
the anterior portion of the series are somewhat different from those in Archeotheriwm, 
haying a transversely broader aspect ventrally and a 
very rugose surface on the sides. Posteriorly the cen- 
tra become more depressed and the rugosities on the 
sides are divided into an anterior and a posterior ares 
Nene 
by a decidedly broad and shallow groove, extending Fig.58 Inferior View of Fifth Lum- 
obliquely from the posterior intervertebral notch to >of. Malandi Peterson. nat. size- 
the ventral portion of the centrum, where it fades away, leaving a sharp ridge on 
the anterior margin of the exit of the groove. The neural arch of the first lumbar 
vertebra is pierced by a canal immediately posterior to the base of the transverse 
process. On the second lumbar is a similar canal on the right, while on the left 
side there is no canal present. 
In another specimen (No. 2126, Carn. Mus. Cat. Vert. Foss.) of Dinohyus hol- 
landi is a last lumbar vertebra which approximates the proper size of the type speci- 
men. ‘This vertebra presents some interesting differences from the corresponding 
bone in the Princeton specimen. Of these differences the more important ones 
are: the proportionately lighter postzygapophyses and the much heavier transverse 
processes in Dinohyus; the enlarged transverse process of the last sacral vertebra in 
Dinohyus, which is due in a great measure to the heavy and rugose posterior border, 
somewhat after the analogy of some of the Perissodactyla (quus). In the last lumbar 
Fia. 59. Posterior, Lateral and Anterior Views of Sixth Lumbar of D. hollandi Peterson. 4 nat. size. 
(Carn. Mus. Cat. Vert. Foss., No. 2126.) 
vertebra of Archwxotheriwm ingens the transverse process has in its posterior border 
hear its base a small and rugose tubercle, which apparently had a tendency to meet 
‘34 series of four posterior lumbar vertebrae (No. 2139B) was found in quarry No. 1 during the last (1908) season 
which furnishes some additional information. There were one and most probably two additional lumbar vertebrae in 
front of this series, judging from the absence of vertebra with no perforations of the neural arches as in the first and 
second lumbars of the type and also from the characters of the fourteenth dorsal, which is present in this series. 
