SOUTH AFRICAN THEROCEPHALIAN REPTILES. 



345 



an irregular transverse suture, and posteriorly with tlie parietals 

 by a transverse serrated suture. 

 There is no postfrontal. 



The postorbital is relatively small, forming tlie posterior half 

 of the upper orbital margin and the upper half of the postorbital 

 arch. It extends backwards by the side of the parietal to the 

 plane of the posterior border of the pineal foramen. 



The parietals are relatively long and slender. In front they 

 are flattened out, and form a transverse suture with the frontals. 

 Posteriorly they form a sharp intertemporal crest, and at the 

 front of the crest is a large oval pineal foramen. From the 



Text -figure 2. 



Upper surface of skull of Ictidosnchus Joiigiceps Broom. 



posterior part of the crest the pa.rietals pass outwards, forming a 

 considerable part of the occipital crest. 



The occiput is very imperfectly preserved. It is shallow and 

 broad, and from the upper margin of the foiumen magnum the 

 bone passes upwards and forwards. The elements cannot be 

 clearly made out, though they are doubtless as in better-known 

 Therocephalians. The squamosals and quadra.tes are lost. 



As already stated, the pa.late has not been fully cleared in front 

 as the matrix is required to support the teeth, but the structure 

 is sufficiently revealed in all the posterior part. A transverse 

 fracture through about the plane of the third last molar shows in 

 section the prevomers. Though very closely placed to each other 



