1906.] 



TEETH OF CREUJDONTS. 



plane, the course of tlie prisms appears to difter a little. But this 

 is a difference purely due to a difference of plane, and not to a real 

 difference of course. 



Text-fio'. 22. 



Sinopa. — Dentine perished, except in places. 



Sinopa (Middle Eocene) (text-fig. 22). — Here again we get just 

 the same pattern, and the same absence of penetrating tubes. 



Text-fia-. 2.3. 



Borhyeena. — Dentine perished, enamel well preserved. 



JSorA^/cena (text-figs. 2.3, 24). — In this genus we find the absence 

 of penetrating tubes, and can distinctly recognise the carnivorous 

 pattern in the course of the j)risms. But apparently the prisms 

 are a little straightei' than in recent Carnivora, or at least in recent 

 Felidte. It is not, however, possible to speak very positively as to 

 this greater simplicity, as I had only a fragment of a tooth at my 

 disposal, and the sections I was able to get were small and may 

 not have included any of the thickest parts of the enamel, where, 

 as has already been noted, these characters are to be found most 

 marked. However, there is ample evidence to say that the 

 enamel of Borhycena is essentially of the Carnivorous type, and 



