Investigations in South African Fossil Reptilia and Amphibia. 95 



At the front of the palate this ridge is replaced by a groove, on either 

 side of which is a less well-marked ridge. 



The following are the chief measurements of the skull : 



Greatest length 450 mm. 



Greatest breadth 330 ,, 



Minimum width of nasal overhang 65 ,, 



Maximum width of nasal overhang 119 ,, 



Interorbital width 141 ,, 



Intertemporal width 15 ,, 



Snout to front of orbit 167 ,, 



Length of orbit 82 ,, 



Basal length 332 ,, 



Minimum width across pterygoids 64 ,, 



Lower jaw. The most recent descriptions of the Anomodont 

 lower jaw have been given by Watson and van Hoepen. The 

 former gives a general account, basing his description of the bones 

 of the back of the jaw on a " fragmentary jaw of Kanncmeyeria 

 collected by the author at Winnaarsbaaken, Burghersdorp District " 

 from which farm this type also comes. In general the jaw agrees 

 with that figured by Watson except that, owing to the difficulty 

 of development, it is impossible to be sure of the presence of the 

 coronoid. Van Hoepen states expressly that a coronoid does not 

 exist either in Lystrosanrus or in Dicynodon ; but he seems certainly 

 to have misunderstood the position of the coronoid as defined by 

 Watson. 



The front of the jaw projects slightly upwards, forming a beak 

 which fits into the concave upper jaw. The front of the mandible 

 has a median ridge running from the point to the mentum bounded 

 by two lateral grooves, one on either side, on the outer side of each 

 of which is a less well-defined ridge. 



The dentary forms almost the whole of the front of the outer 

 surface. Its edentulous border is provided with a longitudinal 

 groove which narrows and deepens posteriorly. The posterior part 

 of the bone is produced into two processes, the upper of w r hich 

 seems to lie outside the surangular and angular. Between it and 

 the lower process is a deep notch. The lower process lies outside 

 the angular. 



In the side view the splenial is only just seen. It forms part 

 of the median symphysis and passes inside the angular, whose thin 

 anterior end lies between the dentary and the splenial. 



