1 12 ANOMODONTIA. 



Suborder PJKIASAURIA. 



Skull with the temporal fossae roofed over, two temporal arcades, 

 cranial bones typically sculptured, and apparently no secondary 

 posterior nares. Dentition fully developed. Yertebrse notochordal, 

 frequently with intercentra, and not more than two in sacrum. 

 Humerus with the inferior aperture of the entepicondylar foramen 

 situated on the distal aspect. Ilium (fig. 26) with its supra- 

 acetabular portion forming an elongated triangular plate lying 

 obliquely to the axis of the sacrum, to which it is attached by a 

 single rib ; ischium and pubis uniting without the intervention of 

 an obturator foramen ; but a small vascular foramen in the pubis, 

 and the anterior border of the latter everted, with a broad roughened 

 surface which may have supported an epipubic ossification. No 

 median bar to interclavicle. 



The typical members of this group were regarded by Owen as 

 referable to the Dinosauria, under the name of Tretospondyli x ; but 

 their Anomodont character was first pointed out by Cope 2 , who 

 included them in his Pelycosauria. 



Family PARIASAURIDiE. 



Dentition forming an uninterrupted series of similar teeth, the 

 crowns of which have more or less distinct vertical flutings or 

 serrations 3 . Typically the vertebras with very low and wide arches, 

 extremely short neural spines, and horizontal zygapophyses. 



It is at present difficult to determine whether some of the cha- 

 racters given under the head of the genus should not rather be given 

 as family ones. 



Genus ANTHODON, Owen \ 

 Imperfectly known, cranium apparently more vaulted and 

 narrower than in Pariasaurus. Teeth with short, compressed, and 

 antero-posteriorly expanded crowns, having a convex sxibtrenchant 

 free edge, marked by numerous crenulations ; roots long, and 

 narrower than the crowns. Centra of dorsal vertebras with deeply 

 cupped terminal faces, and no evidence of the presence of intercentra. 



1 Tapinocephalus was included in the same group. The name Tretospondyli 

 is not adopted for the reason that it is also applicable to most of the Theri- 

 odontia. 



2 Proc. Amer. Phil. Soc. vol. xvii. pp. 529, 530 (1878). 



3 The Parioiichidcs, from the reputed Permian of North America, are 

 distinguished by their dentition being of a carnivorous type (see Nicholson and 

 Lydekker, ' Manual of Palaeontology,' 3rd ed. vol. ii. p. 1056, 1889). 



4 Cat. Poss. Kept. S. Africa, p. 14 (1876). 



