DICYNODONTIA. 15 



Procolophon laticeps, Seeley \ 

 Of larger size than the type species, the skull being wider and 

 more depressed, with a broader interorbital bar. It seems highly 

 probable that this form may be the adult of the preceding, in which 

 case the present name should be retained, since that of P. minor 

 would be inappropriate. 

 Hah. South Africa. 



49427. The imperfect skull ; from the Karoo system of Tafelberg. 

 Agrees closely with the type skull figured by Seeley in the 

 1 Quart. Joura. Geol. Soc' vol. xxxiv. pi. xxxii. figs. 4-6. 



Presented by John Dunn, Esq. 



Specifically Undetermined Specimens. 



R. 514. Fragment of rock showing the outer aspect of a right 

 mandibular ramus ; from the Karoo system of Vogelstruis- 

 fontein, Bethulie district. 



Presented by Herr H. JS. Viljoen, 1884. 



R. 796. Fragment of sandstone showing the external aspect of 

 part of a right mandibular ramus ; from the Cape Colony. 



Purchased, 1886 



Suborder DICYNODONTIA. 



Skull with a single squamoso-maxillary temporal arcade and 

 secondary posterior nares ; premaxilke united to form a single beak- 

 like bone ; mandibular symphysis deep, laterally compressed, and 

 anchylosed : a lateral vacuity in the mandibular ramus. Anterior 

 branches of the pterygoids separated by the palatines and vomer. 

 Never more than one pair of teeth in alveolar borders of the upper 

 jaws, and none in those of the mandible. Vertebrae fully ossified 

 and without intercentra ; four or five in sacrum. Humerus much 

 expanded at the extremities, with a narrow bar over the entepi- 

 condylar foramen, of which the distal aperture opens, high up on 

 the palmar aspect (fig. 13) ; no supinator flange on preaxial border 

 of distal extremity. Pelvis (fig. 3) with an obturator foramen ; the 

 ilium expanded in an antero-posterior direction, and the expanded 

 plate lying nearly parallel to the sacrum. 



1 Qnart. Journ. Geol. Soc. vol. xxxiv. p. 801 (1878). 



