456 Annals of tJir SoutJi African Museum. 



invariably, so far as I am aware, been regarded as the vomer, is 

 really a part of the premaxillary. The true vomer is situated 

 further hack and comparatively small in Ouclenoclon, though well 

 developed in Pti/cJiasia/jum. The chief characteristic of the species 

 is that the beak is almost square, with a median and two lateral 

 vertical ridges. Of described species the only one which might be 

 similarly characterised is Oii'lc.nodon megalops, Owen, but in it the 

 proportions of the palatal structures are very different. The present 

 fossil, moreover, represents a form about twice the size of the 

 type of 0. megalops. The following are some of the principal mea- 

 surements: 



Anterior end of beak to back of medinn ridge ... 113 mm. 



Estimated width of palate 76 mm. 



Width of point of beak 47 mm. 



EXPLANATION OF PLATE X. 



FIG. 



1. Side view of skull of Dicynodon latifrons x - 4 



2. Occiput of ,, ,, x ".<', 



3. Upper view of skull of ,, ,, x :!('> 



4. Palate of Ondcndon tntncaiiis x '40 



