PAL/EOSYOPS LEIDY, AND ITS ALLIES. 
291 
malar forming the inferior rim of the orbit is thick and rounded. At the posterior 
inferior angle of the latter the malar is produced upward in a well marked post- 
oi’bital process. 
Maxillary. — The form of the vertical plate of the maxilhuy in this species is 
more like that of the Carnivores than that of the recent Perissodactyles. This 
portion of the cheek is elongated, being longer than high. The portion between the 
malar insertion and the canine is flat and nearly vertical ; its interior margin, form- 
ing the alveolar border, is only slightly rai,sed above the teeth. The superior part 
articulates largely with the nasals, which send down broad maxillary processes. 
Idle articulation of the maxillary externally with the frontals in front of the 
orbit is ])rohahly very small. Anteriorly the vertical plates terminate in a very 
prominent portion, forming the canine alveolus. The superior internal border of the 
maxillary i'orms the upper half of the nasal notch. This margin is rounded and 
slightly conciive, bordered above by the ascending nasal process of the maxillar}-. 
The situation of the infraorbital foramen is just in front of the malar insertion ; it 
is large and not exposed, and corresponds in position with tlie anterior border of the 
first true molar. 
The ])ortion of the maxillary forming the door of the orbit is short and broad ; 
compared with that of Telmatotherium it is much less in its antero-posterior extent. 
In the I'ccent Tapir the extension posteriorly of the alveolar portion ot the max- 
ilhiry is verv great, but in Rhinoceros it is much less, and it is in about the same con- 
dition in the latter form as in P. paludosus. In the most specialized Artiodactyles 
where the oiLit is placed far behind, the roof of the alveolar portion of the maxd- 
lary forms a small floor to the orbit, the large part of the orbit being opened widely 
below. 
In Palceosyops paludosus, owing to the very short premaxillary region and con- 
seipient non-separation of the anterior premolars by a long diastema as in the Tapir, 
there has lieen no i-reat drawing out of the alveolar region; and thus the roof of the 
alveolar iiortion of the maxillary is short, whereas in the Tapir, owing to the extreme 
length of the dental series, the alveolar border has been prolonged widdy posteriorly. 
The /IiAiA’.— The form of the palate in this species is very bear-like. It differs 
considerably from that of recent Perissodactyles, where the palatine region is 
strongly prolonged forwards and compressed. As in the Carnivores, the hunt of the 
palate is liordered by teeth all around its circumference, there being no considera- 
ble interval in the dental series of P . paludosus. 
In an example of a young specimen of this species in the collection, the palatal 
region is not codsified, and the two horizontal plates of the maxillary form a 
slight kool-like suture. As the pulate is preserved as far as the pesterior bonier ot 
the Hrst true molar, .and it shows no signs of a transverse suture in its whole extent, 
we can solely conclude that the horizontal plates of the palatines fonned only a 
very small portion of the palate, resembling in this respect the palate of the Rhmo- 
39 .rollR. A. X. S. PIIILA., VOL. I.V. 
