34 



ANOMODONTIA. 



Ptychosiagum declive (Owen *). 



Syn. Dicynodon {Ptychognathus) declivis, Owen 2 . 

 Ptychognathus declivis, Owen 3 . 



The type species. Cranium with the occipital and frontoparietal 

 planes forming an acnte angle with one another, and the fronto- 

 parietal and premaxillary planes a very obtuse one ; fronto-parietal 

 plane not convex antero-posteriorly ; premaxilhe much elongated. 

 Parietal ridges of interparietal separated by a considerable interval, 

 which is deeply channelled; frontals carrying a pair of tubercles; 

 maxiilse laterally emarginate for a long distance in front of orbits; 

 occiput flattened above foramen magnum ; muzzle of moderate 

 width. 



Bab. South Africa. 



Ptychosiagum declive.— Occipital aspect, of the cranium ; from the Karoo system 

 of the Cape. ^. pa, parietal ; ip, interparietal ; sq, squamosal ; bo, basi- 



occipital ; co, exoccipital. 



36221. The imperfect cranium ; from the Beaufort beds of tho 

 {Fig.) Karoo system of the Rhenosterberg branch of the Sneew- 



berg range 4 . The type; figured by Owen in the ' Quart. 



Journ. Geol. Soc' vol. xvi. pi. i. figs. 3-5, and also in his 



1 Quart. Journ. Geol. Soc. vol. xvi. p. 49 (18G0).— Dicynodon (Ptychogna 

 thus). 2 Loc. cit. 



:! Cat. Foss. Rept. 8. Africa, p. 48 (1876). 

 4 See Quart. Journ. Geol. Soc. vol. xv. p. 194. 



