658 



MR. R. BROOM ON ANOMODONT REPTILES 



in length, and if an adult it I'epresents one of the smallest known 

 species of Dicynodon. It is chiefly remai'kable for the great 

 length of the orbital and preorbital regions as compared with the 

 postorbital. 



In tlie nasal region there is a large median thickening re- 

 sembling that in Dicynodon sollasi. The frontal region is 

 narrow and the orbits large. The postoi'bital arch is slender 

 and the postorbital bones are q^^ite unusual in shape. There is 

 no trace to be seen, at least on the upper surface, of any post- 

 frontal, and the postorbital takes its place, having an anterior 

 process which forms a considerable part of the supraorbital 

 margin. The posterior process is unusually short, much of the 



Text-figure 36. 





Top of skull of Dicynodon macrorhi/nchus Broom. 



temporal wall being formed by the parietal. The pineal foramen 

 is of moderate size, and is situated as shown in the figure given. 

 The preparietal is long and narrow. 



The posterior portion and much of the palate are crushed. 



The following are the principal measurements : — 



Greatest length probably about 70 mm. 



Interorbital width 7'5 ,, 



Intertemporal width 8 , , 



From snout to front of piiaeal foramen... 47 ,, 



Dicynodon inacrorliynchus is allied to D. sollasi, D. testudiceps, 

 and D. ictido})s, but being from the middle of the Cistecephalus 

 zone, must be from a horizon many hundreds of feet higher than 

 that of any of these others. 



