550 (Jan. 18, 
ope. ] 
the apex opposite to the frontal foramina. Lambdoidal suture confluent. 
The malosquamosal suture marks the posterior edge of the posterior orbi- 
tal rim at the middle of the orbit. The pariéto-squamosal suture has an in- 
ferior position in front. Opposite the front of the postglenoid process it 
converges inwards in line for the occipital bifurcation, and is continued as 
the pariétoéccipital suture, nearly to that point. The squamosal border, 
however, extends in a Z-form to the posterior temporal crest half-way be- 
tween the bifurcation and the meatus auditorius. It embraces an area of 
the posterior face of the skull, and the posterior half of the rim of the au- 
ricular meatus. 
The typical specimen presents only the alveoli of the canine and. first 
premolar teeth ; otherwise the dentition is perfect. The crowns of the 
second and third premolars are obliquely quadrate in horizontal section, 
both a little wider posteriorly than anteriorly. This is due to the presence 
of a half crescent of the internal side, whose posterior horn is attached 
to the external wall, while the anterior is free. The external faces of these 
premolars is slightly convex; of the fourth premolar is slightly concave. 
The first true molar is decidedly smaller than the second, and the second 
is smaller than the third. The external sides of the external columns are 
flat in the first true molar, but become more concave on the third. The 
anterior edges of the columns project; forming ridges; or in section, project- 
ing angles. No intermediate ridges, nor cingula. The third superior true 
molar has a prismatic crown, no roots being visible in either of the adult 
specimens, of which the typical one is rather old, ag indicated by the wear 
of the teeth. In the latter specimen the roots of the second true molar are 
apparent, although the crown is elevated. The first true molar is not pris- 
matic, although the crown is not low. The specimen represented by the 
left maxillary bone contains the teeth which are wanting from the typical 
one. ‘The section of the crown of the canine ig a semicircle, the truncate 
face being posterior internal. It is not a large tooth, and is separated from 
the first premolar by a diastema equal to its diameter, The first premolar 
is one-rooted, the root with a groove on the internal side. The section of 
the base of the crown is a triangle, the faces being anterior, external, and 
posterointernal. Its inner face is concave above the base. 
None of the separate mandibular rami are complete, all lacking the 
angle and condyle. The former is full and round, judging from a frag- 
ment in my possession, The ramus diminishes regularly in depth for- 
wards. The symphyseal region is short, and its anterior face is very steep, 
except at the alveolar region, where it is everted forwards. No trace of 
suture. The internal pterygoid fossa is large and strongly marked, so that 
the inferior edge of the ramus is inverted, so that the surface is convex ex- 
ternally. The last molar is placed somewhat obliquely. The first and 
second premolars are directed outwards and forwards, and the incisors 
directed forwards. 
There are two incisors on each side of the symphyseal line. They are 
very small and subcylindrical, and are closely packed between the canines. 
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