90 MEMOIRS OF THE CARNEGIE MUSEUM 
forms. The infraorbital foramen is'above the posterior part of P®. The palatine 
plates are comparatively narrow transversely and have a considerable concavity in 
the same direction. 
In the region of the palatines the skull is much crushed and the sutures are 
entirely obliterated, so that the outlines cannot be traced. ‘he posterior nares are 
long and narrow, and extend anteriorly to opposite the anterior portion of M2. 
From Kowalevsky’s illustrations (88, Plates XVI; XVII, fig. 5) it is evident 
that the base of the skull and the occiput in Hntelodon is quite different from what 
is observed in the American forms. Judging from Kowaleysky’s figures, the occip- 
ital condyle in the European form has a much greater vertical diameter in propor- 
tion to its transverse, the region of the paroccipital process extends further below 
the condyle, and the process itself is different in shape, being more compressed 
antero-posteriorly, expanded transversely, projecting well downward, and termi- 
nating in arounded point. The base of the zygomatic process of the squamosal is in 
contact with the paroccipital process not unlike what is seen in Sus (See fig. 2 on page 
45). The anterior face of the paroccipital process (see Kowalevsky, Pl. XVI), where 
we should expect to find the solidly fused region between the base of the paroc- 
cipital process and the postglenoid similar to that in the American Entelodonts, 
shows aremarkable similarity to what is seen in Sus, and it would not be surprising 
to find the external auditory meatus situated higher up on the cranium in Hntelodon 
than is the case in the American species. In examining the posterior view of the 
skull of Hntelodon (1. c., Pl. XVII, fig. 5) it is at once observed that the summit of the 
supraoccipital is greatly expanded and again much contracted midway between the 
top and the condyles, and on either side of the median line isa long and narrow 
excayation, which is not present in the American forms. Another similarity to Sus, 
and also to some extent to Hippopotamus, is seen on the superior border of the fora- 
men magnum, where the continuation of the supraoccipital sends down two blunt 
projections, which impart an irregular upper border to the foramen. This latter 
feature does not appear in the American forms. 
The mandible is much elongated to conform with the extremely long muzzle. 
The horizontal ramus is, as in the Oligocene forms, nearly straight, and is character- 
ized by considerable depth and thickness. The inferior border has one large 
knob-like tubercle in the middle region beneath Pz and My, and only a trace of a 
tubercle opposite the posterior face of the symphysis. The angle is also extended 
below the horizontal line of the inferior border, but not to the extent seen in some 
earlier forms. These knob-like processes which are given off from the ventral 
border of the mandible are proportionally small, especially the anterior pair, when 
