68 Annals of the SoutJi African Museum. 



figured by Broom in his description of this species, and passes 

 forward between the large vacuities to meet the prevomer. As in 

 the type the anterior part of the plate bears a number of tiny 

 denticles. Posteriorly the bone covers a large part of the basi- 

 occipital. The lateral articulations with the pterygoids are of the 

 type seen in Eryops. 



The pterygoid forms most of the posterior and outer walls of the 

 large vacuity. Behind the parasphenoid the pterygoid passes back- 

 wards and downwards, articulating with the squamosal and overlying 

 the inner half of the quadrate. Laterally it passes forward outside 

 the large vacuity to meet the prevomer, articulating on its outer 

 border with the palatine. From the posterior corner of this bone, 

 just behind the level of the parasphenoid, the surface is covered with 

 small denticles save for a narrow band on the inner side along the 

 wall of the vacuity. This non-dentigerous band is about 50 mm. 

 long, and at its widest at the posterior end has a breadth of 

 13 mm. In the type specimen there is also an outer non den- 

 tigerous band. As the bone narrows anteriorly the denticles tend 

 to become arranged in well-defined rows. 



The palatine lies between the maxilla on the outside and the 

 pterygoid and prevomer internally. It bears one row of large 

 teeth, of which the first two are larger and more tusk-like and 

 the remainder small and flattened, so that the breadth is greater 

 than the length. There is a slight decrease in size of the teeth 

 posteriorly. The few that are preserved entire show that the teeth 

 were simple, pointed, and conical, with very slight longitudinal 

 grooves. Just behind the internal nares, internal to the row already 

 described, and possibly on the palatine, is a secondary row of three 

 or four similar teeth. 



I am unable to say definitely that a transpalatine is present ; but 

 behind and outside the palatine is a small mass of bone slightly 

 below the level of the palatine bearing three or four medium- sized 

 teeth. This may be the transpalatine. 



The prevomer is large. The pair of bones lie between the posterior 

 nares forming most of the front of the palate. On the outside of the 

 large vacuity they pass back to meet the pterygoids, and between 

 the openings they send back a long process to meet the parasphenoid. 

 In front of the posterior nares are two large tusks. Between the 

 hinder pair of these is a transverse row of smaller teeth, each pre- 

 vomer bearing three. Between this row and the posterior vacuities 

 is a very well-defined dentigerous area coered with denticles, which 

 area passes backwards almost, if not quite, to the pterygoids. 



