On the Skeleton of a Neio Pareiasaurian. 19 



Above the quadrato-jugal is a moderately large bone, which 

 is pretty certainly the squamosal. If this identification be correct 

 the arrangement of bones in the temporal region would agree 

 essentially with the arrangement in Procoloplion, Diadectes, 

 Captorhinus, and most Cotylosaurs, and differ from that of Pantylus 

 in having no prosquamosal. The arrangement of the bones in the 

 occipital and postparietal region cannot be satisfactorily made out. 

 There are two low bosses in the region corresponding to that 

 formed by the post-temporal in Procoloplion, and a third boss 

 near what is apparently the lower end of the squamosal. Immedi- 

 ately above this last boss is a marked groove which curves round the 

 border of the bone. There can be little doubt that this is the groove 

 for the auditory canal. 



The teeth are not very well preserved. In the upper jaw there 

 seem to be 13 in each side. The teeth are relatively larger and 

 flatter than in Pareiasaurus, and the cusps are either smaller or 

 more rapidly worn down. In one tooth, probably the 12th, in which 

 the crown is completely preserved, there are 13 cusps, of which the 

 middle one is the largest, and they are arranged in a semicircle 

 around the anterior half of the tooth. In the anterior teeth there 

 are possibly 15 cusps. 



The palate is not in good condition for showing the detailed 

 structure. So far as can be seen it agrees closely with the 

 Pareiasaiirus palate photographed by Amalitsky. There is appar- 

 ently a distinct transpalatine separated from the palatine by a 

 large oval foramen. The large pterygoid is firmly fixed to the 

 basisphenoid, and there is no possibility of movement. 



The structure of the basicraniurn could not easily be made out 

 without damaging the specimen. 



The lower jaw is pretty well preserved. The anterior part is 

 broad and massive. The splenial is strongly developed and forms 

 most of the inner and lower half of the front of the jaw. The 

 splenial appears to pass back as far as the plane of the middle 

 of the large boss in the angular. The angular is massive, but is 

 not of great antero-posterior length. On the lower border is a 

 single, very powerful boss, which differs from the corresponding boss 

 in Pareiasaurus in being, not hornlike, but slightly expanded at its 

 end, which is flattened. In Propappus omocratus there are two 

 hornlike processes. The articular is broad, but short. There 

 appears to be a distinct but feeble prearticular or goniale. There 

 is also apparently a distinct coronoid bone, but it and the surangular 

 are not very well shown. 



