1908.] 



OF THE FOSSIL REPTILE DIADEMODON. 



615 



and laterally, and a small central tubercle in front. The second 

 indicates two lateral external tubercles. None of the crowns show 

 the slightest trace of wear by the ajjposition of the mandibulai- 

 teeth, in this respect being in striking contrast to Gomjyhognathus, 

 in which the crowns of all the molar teeth are always worn so that 

 nothing remains of tuberculate sti'ucture except the external cusp. 

 The fifth, sixth, seventh, and eighth crowns are preserved on both 

 sides. 



Text-fiff. 130. 



Middle molai- tooth 

 crown, enlarged. 



Restoration of the skull of Biademodon entomopliomis. About |. 



The fifth and sixth crowns are transvei'sely ovate, less than 

 j^Q- inch wide and | inch from front to back. They have a strong 



