240 MEMOIRS OF THE CARNEGIE MUSEUM. 
position of the eye of the horse. Supratemporal ridges only appear upon the 
posterior portion of the frontals a little before their union with the parietals. Over 
and back of the eyes the frontal bones show a broad convex area between which 
is located a shallow depression in the median line. The suture between the frontals 
and the parietals lies at right angles to the axis of the skull, much as in the horse 
and the rhinoceros. 
The nasals are of considerable size, especially behind, where they form a 
broad surface across the lower portion of the face. The greatest posterior extent 
of the curved fronto-nasal suture is opposite the anterior margin of the orbits, 
while laterally the nasals are suddenly bent downward as in the horse, thus furnish- 
ing a considerable portion of the side of the muzzle and also forming a long sutural 
contact with the maxillaries and the lachrymal bones. The anterior portions 
of the nasals were broken off when the specimen (No. 2103) was found, but it is 
evident from what remains that the external margins of the nasals at their ex- 
tremities were, so to speak, bifid, 7. e., there was a lateral external process developed 
posterior to the anterior extremity of the nasals, plainly indicated in No. 2103. 
This feature is well shown in the figure of the skull of Moropus published by Osborn, 
Bull. Am. Mus. Nat. Hist., Vol. XXXII, p. 263 (1918). The general features of 
the skull in this region, 7. e., the long slope of the narial border of the maxillaries, 
and the slope of the nasals themselves indicate that the bones were not of very 
great length. In the model of the skull they are terminated approximately as 
in the horse (see Plates LIII and LX XITI). 
The lachrymal occupies a considerable portion of the side of the face; in size 
and shape it quite closely suggests that of the horse and the rhinoceros. Inferiorly 
it is bounded by the jugal, anteriorly by the maxilla, and superiorly by the nasals 
and frontals. The bone undoubtedly enters into the composition of the anterior 
border of the orbit, but in the crushed condition of the skull (No. 2103) it is not 
possible to exactly define to what extent this is the case. In the model from this 
skull its outline is approximately given (see Plate LIII). The size and position 
of the lachrymal foramen is not ascertainable from the material before us. 
The jugal takes up about the same proportion of the face as in the horse, but 
it is much closer to the alveolar border inferiorly. Its zygomatic process, though 
comparatively light, is heavier, and there is, as in the tapir, a slight postorbital 
process which is not reached by the process of the squamosal, as in the rhinoceros. 
Anteriorly there is a slightly convex area in front and below the orbit, but the 
masseteric ridge of the jugal does not continue forward on the maxillary bone as 
in the horse. Its orbital border is smooth, transversely thick, and gently rounded. 
