860 DR. R. BROOM OK 



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

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

 i-eplacing 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 improba^ble that there are many. The anterior teeth 

 are of the usual Dinocephalia.n 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 mm. The anterior cusp is 

 long and narrow, and on section is semicii^cular. At its base it 

 measures about 9 mm. across and gradually narrows towards the 

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

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

 more. The posterior basal cusp is about 15 mm. in width and 

 has a slightly concave surfa.ce. The posterior teeth have shoi't 

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



The teeth in the lower jaw are apparently closely similar in 

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

 ba.dly weathered a.way, 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. Tlie edges of the long 

 anterior cusps would thus form an admirable cutting apparatus, 

 and the internal cusps would take the part of molars* In the 

 Dinocephalians almost the whole dental appa,ratus is placed in the 

 front of the snout, and the absence of grinding molars such as are 

 seen in the contemporaneous or slightly earlier American herbi- 

 vores, e. g. Diadectes, is explained by the crushing or grinding 

 function having been taken up by the peculiarly specialised 

 incisors. 



Suborder Dromasaueia. 



CiALEOPg wfiAiTSi, gen. et sp. n. (PI. XCI. fig, 6.) 



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

 of a Dromasaurian. The skull is crushed but fairly well presei'ved, 

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

 while remains of about 18 vertebrte are Seen. Unfortunately the 

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

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

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

 probably belongs to the upper part of the Fareiascmrus-Zotie. 



The skull is in many respects very reinarkable. 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 showing 



