64 ANOMODONTIA. 



have been very similar to that obtaining m Dicynodon ; 

 there is no justification for the restoration given in the 

 figure in the ' Phil. Trans./ and it appears that what is 

 there regarded as the upper extremity of the ilium is 

 really matrix. The ischio- pubis closely resembles the 

 corresponding element, which is probably referable to 

 Dicynodon (No. 36244, p. 57) ; but the obturator foramen 

 is less elliptical. The resemblance to the type pelvis 

 renders it almost certain that the present specimen belongs 

 to the same form. Presented by A. 0. Bain, Esq., 1853. 



Family ENDOTHIODONTID^. 



Oral surface of palate and mandible carrying one or more longi- 

 tudinal rows of cylindrical columnar teeth, those of the upper jaw 

 being apparently borne on the maxilla. Nares terminal. Posterior 

 nares in advance of pterygoids, and palatines deeply incurved. 



Until the postcephalic skeleton is known, the serial position of 

 this family cannot be regarded as absolutely fixed. The approxi- 

 mation in the characters of the skull, and more especially the man- 

 dible, to that of the Dicynodontidae, supports Owen's view that the 

 Endothiodontidse should be included in the same suborder ; and if 

 this be correct, it is quite probable that the specimens described as 

 PJatypodosaurus may prove to belong to Endothiodon. 



Genus ENDOTHIODON, Owen \ 

 Syn. Theriognaihus, Owen 2 . 



The type and only described genus. Skull somewhat depressed, 

 with a flattened frontal region and large nasals, separated by a 

 deep groove from the maxillse, and overhanging the nares ; orbits 

 small and lateral ; alveolar border of maxilla and premaxilla with 

 a caniniform swelling ; interorbital region very wide ; occiput 

 unknown. 



Endothiodon has been compared to PJacodus, Sphenodo?i, and 

 Hyperodapedon ; but it differs fundamentally in that there is a bony 

 floor beneath the narial passage ; while, if the interpretation given 

 below be correct, the palatal teeth are supported upon the maxilla 

 instead of upon the palatine and vomer. 



1 Cat. Foss. Kept. S. Africa, p. f>6 (1876). 



2 Ibid. p. 62. 



