1902.] 



DR. R. BROOM ON THE SKULLS OF DIOYNODONTS. 



87 



bony ridge, which is directed outwards and slightly downwards. 

 In the Gill College specimen the tvisk is very powerfully developed 

 and is directed mainly downwards, and in connection with the 

 great development of the tusk the maxillary is a very massive 



Text-fig. 16. 



Outline views of skulls of Bicynodon latifrons : (A) male and (B) female. 



bone. Instead of the bony ridge seen in the Port Elizabeth speci- 

 men, we have here, in a similar situation, a great thickening of bone 

 forming a tuberosity more than twice the width of the ridge ni 

 the other specimen. 



