Oudenodon. 75 



The squamosal is as in Anomodonts generally of very large size. 

 The anterior part extends forward to the level of the posterior 

 angle of the orbit. The zygomatic portion is flattened, and lies in 

 a plane which is directed outwards and slightly upwards. The 

 lower portion of the squamosal is directed almost directly out- 

 wards. It gives support to a well-developed quadrate. 



The occiput is considerably crushed, and the sutures are not 

 distinct. 



The lower jaw is well preserved, and shows beautifulh' the 

 peculiar development of the angular, which gives the jaw as 

 marked an inflected angle, as is seen in Marsupials. A prominent 

 ridge runs along the dentary above the vacuity. Between the 

 angular and a ridge on the upper border of the surangulai' there 

 is a deep concavity such as has been figured by Seeley in Etida- 

 lliiodon. 



An uppor view of the skull of natural size is given in figure 2, plate lY. 



On some points in the anatomy of tlie Anomodont skidl. — By 

 R. Broom, M.D., B.Sc, C.M.Z.S., Victoria College, Stellen- 

 bosch. 



I. — On the Cranio-facial Axir. 



The first endeavour to explain the structure of the cranio- 

 facial axis in any Anomodont was that by Huxley (') in 1(S;")9. In 

 that year he described a skull of a new type of Dicynodont rcptih^ 

 to which he gave the name Dicynodon murrayi (^^Lyf^troxdu ru>i 

 niurrayi), and was able by means of this specimen and by a h'ss 

 ])erfect specimen which he had sectioned, to throw some light on 

 the internal structure of the skull. Unfoi-tunately Huxley com- 

 pletely misunderstood the nature of the bones witli which he was 

 dealing, so that his account of the structure of the cranio-facial 

 axis is quite misleading. What he considers to Ix' the i)resphen<)id 

 is really the vomer : while the structure which he descrilx'S at 

 considerable length as the "■ethmovomerine ])late oi- nasal septum" 

 is entirely a part of the premaxillary Ixme. It is therefore 



