ON SOME NEW AND LITTLE KNOWN CREODONTS. 
l0() 
to tliat of St!ii>oloi>lrm as sliowu by the figures of Professor Cope and M. Filhol, except 
that in this genus tlie brain case is much more capacious. 
Owing to the exceedingly fragile condition of the pterygoids the matrix could 
not b(.> rcnm\-ed from tlie posterior nares, so that the presphenoid is concealed, nor 
could the limits of the orhitosphenoids be satisfactorily made out. The frontah are 
very large. Posteriorly they are wedged in between the parietals by narrow processes 
ami then widen rapidly to form the broad, nearly flat forehead. They arch over the 
eves, forming the upper and part of the front boundary of the orbits. The post-oi'bital 
])roces.s is not very conspicuous. 
The htclupmal is large and as in Hi/cenodon, Thylacynus and many Insectivora 
extends somewhat on the face. The foramen is single and just inside the orbit. The 
malar is long and slender, forming the entire lower bpinidary of the orbit, but 
extends very little on the fixee. It arches strongly outwards and, making a very long 
contact with the zygomatic process, passes as far back as the anterior edge of the 
glenoid fo.ssji. The po.st-orbital process is very feebly indicated. 
'I'lie M/aamofHil forms the side wall of the cranium more extensively than the pari- 
etal. The zygomatic process is at first directed at right angles to the axis of the skull; 
this ]M)rtion is ma.ssivc and projects fixr outwards. The remaining part of the process 
is iM'iit forwards at right angles to the first and is much more slender. Its upper sur- 
liu-e is nearly straight, the lower arches strongly upwards. The glenoid fossa re- 
sxMnbles that of A ref or yoa with prominent pre-and post glenoid crests. As a whole 
the zygomatic arch is exceedingly wide and long, though rather .slender ; its xxpper 
edg(* is vt'ry nearly straight and the glenoid fossa with its massive support projects 
much Im-Iow the level of the arch. 
The aantd» are xery long and narrow. Posteriorly they are broad and just ox'er 
the orbits are wedged in between the diverging frontals; ixarrowing rapidly, they pass 
forwanls as slender splints to the nasial opening. The anterior ends are not emargin- 
at<*«l, nor do they project far beyond the edges of the premaxillaries. 
'I'he premaxilUv are shaped much as in the dogs. The ascending ramus is thin ; 
it arches around the nose, and reaching the nasal, sends back a tapering process which 
is in contact with the nasjil for about an inch. The alveolar portion is stouter ; the spine 
is well develo|M'd, and the incisive foramina are long narrow ox'als. 
'File inajrdhr are very large bones, forming almost the whole of the fiice. The 
two Inmes are not lar from ])aralljel, as the molar series do not dix-erge much. The 
large inlraorbital foramen is placed aboxe the last premolar. The palatine plates are 
broad ; they shoxv no x acxiities. 
I he ]»alatincs are large bones, extending forxvard to the 1st molar, joining the 
plates of the maxillas by a rounded suture. The posterior palatine foramina are x^ery 
small. Along the front margin of the posterior nares the palatines are thickened and 
in the middle there is a short stout spine. They are also produced far back to enclose 
