834 General Notes. 
As regards the phylo- 
genetic significance of the tritubercular molar, I of course 
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never otherwise. Second, that having placed Hyrax ım the 
a a on one page, changed my view on a subsequent page. 
(Tert. Vert. IIL, p. 382). This is also a misconception; reference 
to the page cited shows no such change, nor has any such change 
of opinion ever been made by me. 
fess my own shortcoming in not having long ago § ë 
important memoir. In this study of the structure of pr 
molar teeth of the Ungulata Prof. Rütimeyer antep 
self in 1873. For the first determination of these homologies 
exclusive credit is due to Prof. Riitimeyer. He divides t ió 
teeth of Mammalia into three categories, the simply pr 
“ Homæodont;” the vertically plicate, “ Elasmodont ; and th 
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1 Transac. Amer. Philos. Society, p. 352, fig. 12. roceedi 
*American Naturalist, 1883 HIA velly, p- 407, and P e 
American Philosophical Society, 1873-4, p. 324. 
* Verhand! S. Naturforsch. Gesselsch Basel IT, 1863, p. 558. 
