16 ANOMODONTIA. 



Family DICYNODONTID^. 



Intra- alveolar surfaces of palate and mandible without teeth ; 

 alveolar margins of jaws trenchant; nares lateral; temporal arcade 

 very slender ; posterior nares more backward than in the Endothi- 

 odontidce, and the palatines less incurved. 



The prefrontals are very small, and the lachrymal has its duct 

 situated within the cavity of the orbit. The quadrate has no antero- 

 posterior perforation. 



Pig. 2. 



Dicynodont (JPtychosiagum, sp.). — Dorsal aspect of the cartilage bones of the 

 right side of the pectoral girdle ; from the Karoo system of the Cape. j. 

 sc, scapula ; a, acromial process of ditto ; cor, coracoid ; p.cor, precoracoid. 



Genus DICYNODON, Owen \ 

 The type genus. Skull vaulted, with a pair of tusk-like maxillary 

 teeth, growing from persistent pulps ; a more or less narrow parietal 

 bar ; orbits of variable direction ; and the palate carrying one ridge 

 on the vomer, and a pair of ridges on the premaxillae. General 

 contour of cranium of a normal type, the parieto-frontal plane being 

 continued by a more or less marked curve into that of the naso- 

 premaxillary region ; supratemporal fossae more or less elongated ; 

 preorbital region comparatively short, with the nares near the 



1 Quart. Joum. Geol. Soc. vol. i. p. 318 (1845) ; and Trans. Geol. Soc. ser. 2, 

 vol. vii. p. 59 (1845). 



