L884.) 549 [Cope, 
without intervening ridge. The posttympanic mass is broken away. It 
is inferior in position to the auricular meatus. The latter, being directed 
posteriorly, is considerably produced behind the postglenoid process, leav- 
ing a wide postglenoid fossa. The postglenoid process is rather small, 
and its posterior face is entirely covered by the tympanic bone, while its 
interior edge is in close contact with the otic bulla. The bulla is of enor- 
mous size, and is a slightly compressed oval placed anteroposteriorly, It 
fills the entire space between the postglenoid process and the basicranial 
axis, and reaches anteriorly almost to the line of the anterior border of 
the glenoid region. The pterygoid process adheres to its internal wall 
for half its length, and it sends forwards on the external side of the ptery- 
goid, a narrow acuminate apex. The internal extremity of the glenoid 
savity is concave, and the surface descends, forming a robust peduncle, as 
large as the postglenoid process, to which the anterior part of the otic bulla is 
attached, This is a character I have not seen in any other species of the 
family. A wide surface, continuous with that of the glenoid face, extends 
on the external side of the pterygoid ala of the sphenoid, to the angle 
where it unites with the pyramidal process of the palatine. It there termi- 
nates abruptly, but the external angle marks the end of a ridge, which ex- 
tends upwards and forwards to the postorbital process of the frontal. An- 
terior to this line the cranial wall is concave ; posterior to it, convex. The 
processi pyramidales are divergent, and have thickened and rounded infe- 
rior edges. The maxillary bones are produced a little beyond their bases, 
leaving a notch between. The palatal surface is uniformly moderately 
concave, 
The incisive foramina are large; the septa are wanting in my speci- 
mens, perhaps accidentally, The infraorbital foramen is above the middle 
of the fourth premolar tooth. The frontal foramina are further apart than 
in any other species of the family, being equidistant between the median 
line and the supraorbital border. There is an internal orbital foramen be- 
low the postorbital process, as in other species of the family. There are 
three postpariétal foramina, two of which are on the squamosal suture. 
Below the anterior of these two is a large postsquamosal foramen. 
No supra or postglenoid foramina. The meatus auditorius externus 
looks equally externally and posteriorly. It is large and of oval out- 
line, the long diameter being parallel to the superior border, which 
is the usual suprameatal crest. Its tympanic or anterior border is very 
prominent, while the posterior border is wu little less so, A posttym- 
panic tuberosity marks the middle of the inferior edge. Posterior to 
the meatus is the rather large mastoid foramen, which is above the in- 
ternal base of the paroccipital process. The basicranial bones being lost, 
the characters of the basal foramina are not determinable. The posterior 
nares are deeper than wide. The palatonareal border is a Gothic arch, of 
which the apex is opposite the posterior border of the last molar tooth, I 
perceive no palatal foramina, 
-The median and posterior nasal sutures remain. The latter isa V with 
