860 DR. R. BROOM OX 



The teeth are for the most part badly preserved, but as they 

 are broken off at different levels and as a large number of 

 replacing teeth are present, the structure can be made out without 

 much difficulty. There are 14 teeth preserved, of which the 

 first five are large and long. From the 6th backwards the teeth 

 steadily decrease in size and the crowns become quite short. 

 Possibly there are two or three teeth lost behind the 14th, but 

 it seems improbable that there are many. The anterior teeth 

 are of the usual Dinocephalian type. They are, except where the 

 root is being absorbed by a replacing tooth, of great length, the 

 ■whole root and crown being about 90 niuii The anterior cusp is 

 long and narrow, and on section is semicircular. At its base it 

 measures about 9 mm. across and gradually narrows towards the 

 point. None of the anterior upper teeth shows the whole anterior 

 cusp, but it probably measures about 20 mm. in length if not 

 moi-e. The posterior basal cusp is about 15 mm. in width and 

 has a slightly concave surface. The posterior teeth have short 

 cusps. The 12th tooth has a crown only 12 mm; in height. 



The teeth in the lower jaw a.re apparently closely similar in 

 type to those in the upper. Most of the functional teeth are 

 badly weathered away, but the weathering shows that at the base 

 of each is a well-developed replacing tooth similar in type to the 

 functional one. It seems probable that the long anterior cusps 

 of the front teeth interdigitated and that the grinding took place 

 by the meeting of broad posterior cusps. The edges of the long 

 anterior cusps would thus form an admirable cutting apparatus, 

 a,nd the internal cusps would take the pai't of molars. In the 

 Dinocephalians almost the whole dental apparatus is placed in the 

 front of the snout, and the absence of grinding molars such as a,r6 

 seen in the contemporaneous or slightly earlier Amei-ican herbi- 

 vores, e. g. t)iadectes, is explained by the crushing or grinding 

 function having been taken tip by the peculiarly specialised 

 incisors. 



Suborder DROMAsAuitiAi 



GAleops wtiAiTSi, geni et sp^ n. (Ph XCI. fig. 6.) 



This ilew genus is founded on the anterior half of the skeleton 

 df a Dr5masaurian. The skull is Crushed but fairly well preserved, 

 arid the shoulder-girdle and front limb are in good condition, 

 while remains of about 18 vertebrse are seen. Unfortunately the 

 matrix is very hard and little can be done in the way of develops 

 ment. The specimen was found by Mr. Whaits oh the farm 

 La-de-da, about 20 miles to the west of Beaufort West, and 

 probably belongs to the upper part of the PareiasaurUs-ZoTae. 



The skull is in many respects vely remarkable. The orbit is 

 exceedingly large and the temporal fossa deep and very narrow, 

 and the squamosal has a long descending process which brings 

 the quadrate below the back of the orbit. The face is very shortj 

 and there appear to be no teeth in either upper or lower jaW. 



The bones of the skull are not in good condition for showiilg 



