South African Fossil Reptiles and Ampliih'ni. 133 



slender. The parietal bar is just broader than the frontal region, 

 and convex longitudinally. The temporal openings are large. 



The premaxilla passes on to the top of the snout, separating the 

 nasals except for a length of 15 mm., but forming no part of the upper 

 border of the nostril. 



The septomaxilla is well seen on the face. It separates the nasal 

 from the maxilla and articulates posteriorly with both the prefrontal 

 and the lachrymal. The lachrymal is small. The prefrontal is large 

 and forms a large portion of the orbital border. 



The arrangement of the bones around the pineal foramen is shown 

 in the figure. The pi'eparietal is small and forms half the border 

 of the pineal foramen. The postfrontal is short, but fairly broad 

 anteriorly. 



Fio. 29. Dicynodon cy clops, Htn. Typo. Side view of snout. 



From Dicynodon platyceps the species differs in having the inter- 

 temporal width equal to that of the frontal region, in the small 

 preparietal and in the detailed arrangement of the postfrontals, 

 froutals, and parietals. From Dicynodon lutriceps it differs in the 

 relation of the width of the frontal and parietal bars and in the fact 

 that the preparietal in the earlier type is apparently wholly in front 

 of the pineal foramen and enclosed by the frontals. No adequate 

 figure of the arrangement of the bones in D. lutriceps has ever been 

 given and I have not seen the type ; so it is impossible to say here 

 whether the two species are actually distinct. 



Type. Skull. (S.A. Mus. Cat, No. 3447.) 



Locality. Dalham, Graaff Keinet, C.P. 



Horizon. Lower Beaufort Beds. (Endothiodon zone.) 



DICYNODON FELICEPS, Owen. 



1876. Owen. Cat, Foss. Kept, S.A., p. 45 ; pi. xliii. 

 1889. Seeley. Phil. Trans, clxxx B ; pi. x, fig. 3. 



