On a Skull of Tapinocephalus atherstoni, Owen. 



41 



duplicate, one suspects that all the bones are from one locality and 

 of one individual. In 1909 Broom described a Dinocephalian skull 

 in the possession of the British Museum under this same specific 

 name. Dr. Broom now informs me, however, that it is almost 

 certain that this latter skull, howbeit a Dinocephalian, is not 

 Tapinocephalus atherstoni, although closely allied to that species. 

 The greatest length of the skull under description is 530 mm., 

 while the distance from the occipital condyle to the front of the 

 snout is 435 mm. The maximum width of the skull is equal to its 

 length, while its height in the temporal region is 285 mm. It con- 

 sists of a large, high, broad, rounded temporal and posterior portion 

 and a flat, broad snout. The frontals rise abruptly from the nasals 

 almost at right angles. 



FIG. 5. Tdpinocephalns atherstoni, Owen. 

 Side view of skull, x 



Owing to the weathered condition of the surface of the skull, and 

 the hardness of the matrix, the sutures between the bones are not 

 easy of determination. Fortunately, however, on arrival at the 

 Museum the skull was found to be broken in several pieces, a fact 

 which has materially assisted in the working of the skull. The 

 palate is very well displayed. 



The premaxilla was comparatively small, and bore teeth, as did 

 the maxilla. Most of the teeth are lost, and the number is indeter- 

 minable. Just behind the junction between the premaxilla and 

 maxilla of the left side there is a portion of a large tooth, and, 

 internal to it, is a small secondary replacing tooth, circular in section, 

 5 mm. in diameter. 



The maxilla is large, moderately flat, and carried teeth. Its 



