SOME CARNIVOROUS THERAPSIDS. 1037 
suddenly, leaving the ridge on the pterygoid to form the side of a 
narrow interpterygoid vacuity ; further forward the flange of the 
pterygoid meets its fellow of the opposite side, and the two run 
on in contact till they are again separated by a small round 
interpterygoid vacuity. 
At the side of this region the process which combines with 
the transverse bone to form the powerful pterygoid flange is 
given off. 
Further forward the bone bears a ridge with two irregular 
rows of teeth, and finally undoubtedly continues forward to the 
prevomer. 
On the block from which the median part of the palate has 
been split away, there is very clearly shown a long. median bone 
forming a narrow vertical plate. That this bone is not, as it 
might conceivably have been, formed by a fused pair of ridges on 
the dorsal surface of the pterygoids, is shown by the occurrence 
of very fine but I think definite sutures, between its posterior 
end and the pterygoids, and conclusively by the fact that what is 
undoubtedly a part of the pterygoid is applied to its lateral face 
ending in front ina very obvious manner. ‘This median bone is 
clearly seen to pass between the posterior ends of the prevomers 
in front. 
There can be no doubt but that this bone is the same as the 
vomer of Diademodon, and is the median bone in the same position 
which, if Lam right, occurs in Gorgonops. 
The palatine is a large bone with a long suture with the 
maxilla; posteriorly it forms the front border of the large sub- 
orbital fossa and its inner edge has a suture with the pterygoid, 
finally it has a short contact with the prevomer. 
The two prevomers are very clearly seen in the specimen ; 
posteriorly they are separated by the vomer, but in front they 
are in contact ; the lower surface of the bar between the posterior 
nares, which is formed by them, has exactly the same form as that 
of the similar bar (which in my view is probably formed by a 
pair of fused prevomers) in Glorgonops. 
The palate just described differs from that of Scylacosaurus 
only in the presence of the very narrow vomer. 
This palate will be seen to resemble that of Lauria in very 
many features; in fact it differs from the palate of the nearly 
contemporary Gorgonopsids in exactly the same features that the 
palate of Bauria differs from that of a Cygnognathid. 
This specimen is the first that has shown a definite median 
vomer and a pair of paired prevomers in the same animal. It 
seems to me to add a very strong argument in favour of Dr. 
Broowm’s view that the mammalian vomer is not homologous with 
the “vomers ” of a Lizard. 
The various new facts brought forward in this paper show that 
the accepted division of the “ Carnivorous” Therapsids into 
Therocephalia, Gorgonopsia, and Cynodontia, is far from satis- 
factory. In my opinion the differences between Lauria and its 
