56 



MR. C. S. TOMES OX TUE 



[Jan. 16, 



bears no more resemblance to that of the Marsupials than does 

 that of other Oreodonts. 



Text-fiff. 24. 



Borliycena.- — Dentine well preserved in places. The plane of this section is not quite 

 the same as tig. 23, but only fragments having been available it is not possible 

 to define the plane in which the section la^-. 



Text-fii?. 25. 



Cynodictis. — Longitudinal section. Enamel prisms all parallel; Iiere and there 

 dentine-tubes penetrate a little way into the enamel. 



Didynictis (Lower Eocene). — Of this genus I have only two 

 sections, but in them the enamel prisms are all parallel and 

 pursue a course only slightly curved. The typical carnivorous 

 pattern is not to be found, nor is there any trace of it, so 

 that of the Oreodonts examined this and Cynodictis stand 

 alone in this respect. Portions of enamel might be found 

 resembling this in the teeth of the Dog, if taken towards 

 somewhat low down upon the tooth, but the enamel is in the two 

 sections I have obtained tolerably thick, and might have been 

 expected to show more complexity of structure if any such exists 

 anywhere upon the tooth. 



C'///?o(Z/c</s(01igocene) (text-fig. 25).— A specimen of this genus 



