144 Annals of the South African Museum. 



DlCYNODON LACEKTICEPS, Owen. 



1876. Owen. Cat. Foss. Kept. S. Afr., p. 30; pi. xxii. 

 1890. Lydekker. Cat. Fuss. Kept. & Amphib., iv, p. 18. 



Founded on a skull with lower jaw. Comparatively small. Greatest 

 length of type skull about 158 nun. Orbits directed forwards and 

 laterally, sub-circular, almost as large as the temporal openings. Inter- 

 orbital width 25 mm. Temporal fossae directed upwards. Post- 

 orbitals almost meet on the parietal bar ; parietals narrow. Root of 

 tusk inclined forwards and downwards. Parietal foramen probably 

 on a level with the front of the temporal fossae. 



Type in the British Museum. 



Locality. " Tarka prolongation of the Winterberg," C.P. 



Horizon. Lower Beaufort Beds. (Probably Cistecephalus zone.) 



DlCYNODON LATICEPS, Broom. 



1912. Broom. Proc. Zool. Soc., p. 868 ; pi. xcii, figs. 12, 13. 



1915. Broom. Bull. Amer. Mus. Nat, Hist,, xxv, 2, p. 131 ; fig. 17. 



Two skulls collected by the Rev. J. H. Whaits from the Graaff 

 Reiuet District are interesting as showing the changes which 

 apparently take place with the advance from youth to maturity. One 

 skull (S.A. Mus. 'Cat. No. 3423) is a fully grown male agreeing closely 

 with the type. The other (S.A. Mus. Cat. No. 3328) is a young male, 

 and, although it displays main features in common with the other, 

 shows some points of difference in detail. The latter skull is 

 iucompleie, but the sutures of the top of the skull are beautifully 

 displayed. 



The two skulls are of the broad-headed variety, with a broad frontal 

 region and a broad parietal region narrowest in front. The orbits 

 are large and triangular and the snout short, The nostril is fairly 

 large. In the old skull the nostril is overhung by a large projecting 

 nasal boss ; but in the smaller skull this boss is very rudimentary. 

 The internasal width is large. 



The postorbitals are long and slender, and, although they form the 

 upper borders of the temporal fossae, in neither skull do they appear 

 on the top of the parietal bar behind the pineal foramen. The whole 

 of the broad expanse of the posterior part of the bar is formed of the 

 parietals, the postorbitals facing entirely outwards. The preparietal 

 is large; but, while in the younger skull it is raised on a bony 

 eminence above the level of the top of the skull, in the older specimen 



