356 ROY L. MOODIE 
as the casts of the foramina orbitale, rotundum and ovale, or 
those passageways of the three main divisions of the trigeminal 
nerve, namely, the ophthalmic, the maxillary, and the man- 
dibular. Thisisstrikingly similar to the arrangement in the 
modern domestic cat. The rounded triangular elevation pos- 
terior to the bases of these nerves may be interpreted as the 
cast of the cavity in which lay the semilunar ganglion, embedded 
within the dura mater. Separated as the ganglion thus was 
from the floor of the brain case, it is difficult to interpret the 
slight ridges running fanwise posteriorly over the surface of the 
ganglia. They might be fasciculi if seen on the surface of 
the ganglia themselves. These elevations extend over on to the 
surfaces of the cerebral peduncles and may be interpreted as 
indications of small meningeal nerves. The cerebral peduncles 
are clearly preserved as a V, between the prongs of which is to 
be seen the well-marked interpeduncular fossa. 
The auditory region (Mos.pet.) is not readily interpreted. The 
internal acustic meatus (M.a.7.) is indicated in both sides as a 
broken oval base. The characters of the medulla are not clearly 
shown, since the topographic features of this organ are not 
clearly impressed upon the skull. 
The entire cast measures 73 mm. in length and displaces 50 cee. 
of water. The cerebrum, as preserved, measures 52 mm. in 
length and 45 mm. in width. The cerebellum extends 36 mm. 
transversely. 
The cerebellum (cer., figs. 9 and 10) is fairly well preserved. 
This is indeed fortunate, since the region was obscured in Dinictis 
(fig. 3), and we are thus allowed an insight into the nature of the 
cerebellum in Oligocene cats. The parts are identified according 
to the terminology of Bolk (’06). As in other primitive mam- 
malian brains, this organ is divided into three main lobules. 
The lobulus simplex is very prominent, at least I judge this 
prominence to be that lobule, though I am unable to identify the 
situation of the sulcus primarius, due to injury to the specimen. 
A less prominent division lying to either side of the prominent 
lobulus simplex is the lobulus paramedianus. It lies somewhat 
further laterally than in the modern lion, but otherwise has 
