142 Annals of the South African Museum. 



DlCYNODON HALLI, Watson. 



1914. Watson. Ann. Mag. Nat. Hist., ser. 8, xiv, p. 95 ; fig. 1. 



This species is closely allied to D. planus, and, according to Dr. 

 Broom, the two names may be synonymous. It is probable that 

 Watson was mistaken in showing the preparietal as extending along 

 both sides of the pineal foramen. The line shown in his figure I take 

 to be a part of the V-shaped suture between the frontal and the 

 parietal. It would seem better to keep the two species distinct on 

 account of the difference in the ratios between the frontal and inter- 

 temporal widths. In D. planus the iuterorbital width is equal to, or 

 slightly greater than, the inter/temporal width and the parietal bar is 

 of constant width throughout. In D. halli the relative widths are 

 reversed, and the parietal bar gradually broadens posteriorly. 



A specimen in the Museum collection agrees closely with the figure 

 given by Watson. It is a slightly distorted skull and lower jaw (S.A. 

 Mus. Cat. No. 3414) collected froni the Cistecephalus zone at Dunedin, 

 Beaufort West, C.P., by the Rev. J. II. Whaits. It shows the same 

 small face and general proportions as the type, and has apparently the 

 same small occipital coudyle without tripartite division. A curious 

 feature is the height of the basicrauium above the level of the 

 quadrates, which bones are also close together, lying directly below 

 the post-temporal vacuities. In consequence the stapes must have 

 been steeply inclined and the fenestra ovalis looks almost wholly 

 downwards. The basisphenoid tubera were not very prominent. 



The bones of the top of the skull are well seen. The preparietal 

 forms only the anterior border of the pineal foramen and is broadest 

 near the front, being somewhat truncate anteriorly. The other bones 

 are as shown by Watson. 



Type. Skull and skeleton in the British Museum. 



Locality. Kuil's Poort, Beaufort West, C.P. 



Horizon. Lower Beaufort Beds. (Cistecephalus zone.) 



DlCYNODON INGENS, Br. 



1907. Broom. Ann. Natal G-ovt. Mus., i, p. 168 ; pi. xxviii, figs. 1-4. 



Founded on the well-preserved palatal portion of a skull. Large ; 

 palate longer than broad ; prominent median ridge on palate ; front of 

 snout unusually straight, with low median ridge and slight lateral one. 

 Nostril large. 



