FROM THE KARROO BEDS OF SOUTH AFRICA. 



649 



many imperfect ones discovered near Biesjespoort on a horizon 

 which I believe to be at the very top of the Endothiodon zone, 

 and it appears to extend a short way into the Cistecejyhalus 

 zone. Though many skulls, both males and females, are known, 

 I take as the type one of the best preserved, which I believe to 

 be an adult male. It is about 5 inches in length and a little less 

 than 4 inches in width. 



The beak is about the same length as the orbit and moderately 

 sharp in front. Tlie nostrils are fairly large, and behind them 

 the maxillaries meet the nasals, and the septomaxillaries do not 

 appear on the side of the face. 



Immediately behind the plane of the nostrils is a thickening of 

 the bones which forms a I'ound button-like low boss in the middle 

 line. Above and behind the canine is a thickened elongated 

 rida'e. 



Text-iio-ure 28. 



Text-figure 29. 



Text-iig. 28. — Skull of Dicynodon sollasi Broom. Reduced. 



Text-fig. 29. — Preparietal region in Dicynodon sollasi Broom. Nat. size. 



The interorbital region is flat and narrow. The orbits look 

 upwards and outwaixls. 



The parietal region is only very slightly wider than the inter- 

 orbital, and the large postorbitals largely overlap the parietals 

 .and almost meet in the middle line. 



The preparietal region is not well displayed in the type skull, 

 but is well seen in a number of others. 



The pineal foramen is relatively small, and is situated a few 

 millimetres behind the plane of the back of the postorbital arch. 

 The preparietal is small, and is flanked by fairly large anterior 

 processes of the parietals. The postfrontals are nearly obscured 

 by tlie paiietals and postorbitals, biit form a distinct though 

 small part of the orbital margins. 



44* 



