Petrophryne gran'aiata. 



— 150 - 



though it does not permit the cranial sutures to be so 

 Fig. 3. precisely defined as in the non- 



enamelled skulls of Saurians, 

 yet manifests indicationsof those 

 sutures which are not alto- 

 gether devoid of significance. 



The dentiferous part of the 

 lower jaw, like the opposed bor- 

 der of the upper jaw is «en une 

 ligne presque droite,« as in 

 Bhinosatirus, and the teeth are 

 subequal, numerous, small slen- 

 der ('fines'), and sharp-pointed. 

 They are somewhat closer set than in Bhinosaurus; I 

 count 26 along the side of the upper jaw in which they 

 are best preserved (fig. 2). There are 24 of such teeth 

 in the corresponding part of the skull of Rhinosaiirus 

 (loc. cit. p. 6). 



The tympanic element of the temporal, fig. 2, 28, is 

 large, convex ('bombé'), produced backward (avançant 

 en arrière'), and separated above from the mastoidal ele- 

 ment (ib. 8) of the occiput by a large notch (ib. v). The 

 resemblance of the South African fossil to the Moscou 

 one (loc. cit. tab. V) is close and significant in this cha- 

 racter. The occiput is similarly broad, low and truncate 

 behind. But the character of most importance in deter- 

 mining the ordinal affinities of Bhinosauru.<^ could not 

 be discerned in that fossil, apparently by reason of the 

 close attachment to their matrix of the atlas and other 

 cervical vertebrae to the cranium *}. 



*) See the figures in Tab. V and the remark: „ — Les vertèbres 

 attachées au crâne sent trop empâtées dans la matrice pour en in- 



