152 



Annals of the Sovith African Museum. 



preparietal is seen to be a fairly large bone which touches only a 

 minute fraction of the pineal foramen. The postfrontal is long and 

 narrow, and the parietal has but one anterior process passing between 

 the frontal and preparietal. 



Since the original paper the occiput and basicranium of the type 

 skull have been cleared of matrix. The occipital plate is nearly 

 vertical. The foramen magnum is large, its upper margin being more 

 than halfway up the skull. Consequently both the interparietal and 

 supraoccipital are somewhat shallow bones. Sutures are not well 

 shown on the plate, so that the exact limits of each bone cannot be 

 determined. The lateral vacuity lies at the level of the middle of the 



FIG. 36. Dicynodon testudirostris, Br. & Htn. Type. No. 2354. Pre- 

 parietal region. Natural size. 



foramen magnum. The occipital condyle is tripartite with a large 

 central pit. The foramen for the 9th-12th nerves looks almost 

 entirely backwards and outwards ; it is large, and most of its border 

 is formed by the paroccipital. 



The basioccipital tubera are prominent, and wholly below the level 

 of the coudvle. The fenestra ovalis is almost as low as the quadrate. 

 Between the tubera the basioccipital is deeply grooved. The basi- 

 spheuoid is short. Anterior to it the pterygoids form a broad, short 

 plate 11 mm. wide. Just behind the iuterpterygoid vacuity is a 

 median knob. 



The quadrato-jugal is peculiar in that it is apparently not auchy- 

 losed to the quadrate. On the left side it is seen in position, lying on 

 the downward process of the squarnosal and widely separated at the 

 articular end from the quadrate. On the other side it is detached from 

 the skull. 



