On Tivo New Species of Dicynodon. 37 



believed to be absent in Dicynodon. Then it was clearly seen in one 

 or two specimens. Probably we shall find that in some species it is 

 present and in others absent. 



The nasal is fairly large, and has a large articulation with the 

 frontal, the maxillary, and the premaxillary. 



The lachrymal and prefrontal are much reduced. Probably the 

 lachrymal is considerably hidden by the nasal and maxilla, but the 

 prefrontal can only be regarded as quite rudimentary. In many 

 species of Dicynodon it is a large bone, and the great reduction here 

 seems to suggest an affinity with Cistecephalus, where it is also 

 rudimentary. 



The frontal is large and forms most of the upper margin of the 

 orbit. The postfrontal is present, but very small though fairly long. 



The postorbital is very large, and besides forming the whole of the 

 outer part of the postorbital arch it forms almost the whole of the 

 upper margin of the temporal fossa. The pair of postorbitals form a 

 large part of the upper surface of the skull, meeting each other 

 behind the pineal foramen and covering most of the parietals. 



The preparietal is fairly large and almost entirely in front of the 

 pineal foramen, only a minute portion of the bone touching the front 

 of the foramen. 



The parietals are well seen on each side of the foramen and in 

 front of it, but are mainly hidden behind by the postorbital. 



The squamosal is of usual type and presents no specially note- 

 worthy features. The quadrate- jugal is very large, and apparently 

 not anchylosed to the quadrate, as is usually the case. 



The palate has not been fully displayed in either of the specimens, 

 but so far as can be seen is of the normal Dicynodon type. 



DICYNODON ALTICEPS, sp. uov. 



The skull on which the following description is based was collected 

 about one mile west of Oudeberg, in the division of Graaff Beinet, on 

 the main road cutting between Murraysburg and Graaff Beinet. 

 Although crushed and slightly distorted, and imperfect in the 

 zygomatic arches and the tip of the snout, the skull is in a good 

 state of preservation. 



In general appearance the skull resembles Dicynodon leoniceps, 

 but besides being much smaller, it differs from Owen's species in a 

 number of important particulars sufficient to warrant us in the 

 erection of a new species. 



The snout is inclined at an angle of about 50 to the plane of top 

 of skull. 



