DTCYXODOiraD^. 29 



of Dicynodon and Udenodon to justify this view. If the specimens 

 described as Platypodosaurus prove to belong to Udenodon, its right 

 to generic distinctness will be certain. 



The specimens from the Upper Permian of Russia, described and 

 figured by Trautschold in the ' Mem. Soc. Imp. Nat. Moscou,' vol. xv. 

 pt. i. p. 35, pi. viii., as Udenodon rugosus, seem too imperfect to 

 admit of definite determination. 



Udenodon baini, Owen \ 



Syn. Udenodon brevirostris, Owen 2 . 

 (?) Udenodon raniceps, Owen 3 . 



The type species. Of large size. Cranium with a short muzzle, 

 in which the caniniform ridge is nearly vertical ; orbits small and 

 directed frontally; parietal and interorbital bars comparatively 

 short and wide in the young ; in the adult the parietal bar forming 

 a sharp crest. Plane of occiput sloping backwards. 



There appears every reason for regarding U. brevirostris as the 

 adult of this form. 



Hab. South Africa. 



36232. The somewhat imperfect cranium of a young individual ; 



(Fig.) from the Beaufort beds of the Karoo system, near Fort 

 Beaufort. The type specimen ; figured by Owen in the 

 ' Quart. Journ. Geol. Soc. ? vol. xvi. pi. i. fig. 1 (with a 

 restoration of the mandible), and also in the ' Catalogue of 

 the Fossil Beptilia of S. Africa,' pi. lvi. fig. 2, and pi. lx. 

 The occiput and hinder portion of the palate are concealed 

 by matrix ; and the everted inner borders of the orbits 

 are partly broken. Presented by A. G. Bain, Esq., 1853. 



R. 1649. The imperfect cranium of an adult individual ; from the 

 (Fig.) Karoo system of the Graaf-Beinet district, on the southern 

 flank of the Sneewberg range. Figured by Owen in his 

 1 Catalogue of the Fossil Beptilia of S. Africa/ pi. lviii., as 

 U. brevirostris, of which it is the type. So far as can be 

 seen, and allowing for difference of age, this specimen 

 agrees in all essential characters with the type, the pro- 

 duction of a sagittal crest being evidently due merely to 

 age. The orbits appear to be relatively wider, but their 

 borders have been extensively broken away. The canini- 



1 Quart. Journ. Geol. Soc vol. xvi. p. 55 (1860). 



2 Cat. Foss. Kept. S. Africa, p. 57 (1876). 



3 Ibid. p. 61. 



