PAL.EOSYOPS LEIDY, AND ITS ALLIES. 
287 
canines. The premaxillary symphysis is round and short in this species ; its fyrm 
is in strong contrast to that found in the allied genus Telmatotherium, where the 
symj)hysis is much elongated and narrow. The premaxillo-maxillary suture is 
situated about midway between the outer incisor and the canine ; its superior 
termination is on a line with the posterior border of the latter. The nasal notches 
in this species are moderately deep and their upper and lower margins are less 
sinuous than in P. megarhinus. Above, the broad plate-like nasals form the roof 
of the nasal cavity, being prolonged anteriorly as far as the premaxillary suture. 
The premaxillaries form the lower half of the nasal notch, the latter terminating 
above the anterior border of the third premolar. Tlie portion of the skull between 
the superior termination of the nasal notches and the orbit is elongated and 
broad. In the Tapir, owing to the great reduction of the nasals and con- 
sequent posterior prolongation of the anterior nares, the lamina between the orbit 
and nasal cavity becomes very narrow and is bordered internally by a long ascend- 
ing 2)rocess of the maxillary, which, in the skull of Palceosyops paludosus, is very 
short. 
Nasa/s. — The nasals are very broad in comparison with their length in this 
species. They were not coosified, and not nearly so strongly arched laterally as in 
Telmatotherium. Their superior surface is convex and their external border in 
front is curved in outline, terminating at the • free extremities in rather pointed 
and rounded borders. The posterior portion of the nasals is very broad and flat. 
The posterior terminations of the same Avere probably on a line with the anterior 
l)ortion of the orbit, although in the skull under description the facial sutures are 
badly damaged. 
Frontals . — The frontals have a more anterior extent than in the Tapir. 
Their anterior prolongation is probably as far as the anterior orbital region. 
There Avas probably no articulation betAveen the frontals and the ascending pro- 
cesses of the premaxillaries, as seen in tlie Carnivores. The frontals send doAvn 
very large postorbital processes, but they do not meet the ascending process from 
the malar. It is impossible to determine the relation of the frontals to the bones 
of the lateral sphenoidal regions OAving to the damaged condition of the skull. 
Posteriorly the frontals extend on a vertical line with the posterior inferior mar- 
gin of the temporal fossa. The extension of the frontals posteriorly is the same 
as in the Tapir skull, and differs from the frontals of recent CamAores where they 
extend to the middle of the temporal region. 
Parietals. — The parietals form the largest part of the temporal fossa, but do not 
extend so for beloAA" as in the Tapir. Their surface is deeply concave and at the 
posterior part of the parieto-squamosal suture a number of postparietal I'oramina 
are present. In the Tapir’s skull the parietals are preAmnted from articulating Avith 
the alisphenoids by the articulation of the squamosals Avith the frontals. The con- 
dition of the skull under consideration does not allow us to determine this point. 
At the posterior superior angle of the temporal fossa the edges of the parietals 
