Marsh Collection, Peabody Museum. 119 



preserved superior premolar, probably the fourth, and the 

 greater part of the right humerus. 



The jaw is deep and the symphysis strong and heavy. The 

 two rami are firmly coossified, but traces of the suture are 

 plainly visible. The canines are large, somewhat laterally com- 

 pressed at the base, with a recurved pointed crown. The 

 incisors are two in number upon each side, one being placed 

 almost directly behind the other ; their roots are much com- 

 pressed from side to side and they are relatively small. The 

 first premolar of the series, which corresponds with the second 

 of Oxycena, is a two-rooted tooth implanted obliquely to the 

 long axis of the jaw ; its crown is made up of a single pointed 

 anterior cusp, to which is added a broad posterior heel bearing 

 a minute cusp in the center. The second premolar is similar, 

 with the exception that there is a distinct anterior basal cusp 

 and the heel is thrown up into a more or less cutting ridge. 

 The third premolar is considerably larger than the two in 

 advance of it, but the crown is composed of the same elements 

 as that of the second. The superior 



premolar, figures 67, 68, which 6T 



presumably corresponds with the 

 fourth of Oxycena, is a three-rooted 

 tooth; its crown is composed of 

 two external and one internal cusps. 

 Of the two externals the anterior 

 is the larger, of a more or less coni- 

 cal form, having its posterior edge Figures 67, 68.— Fourth supe- 

 produced. The posterior is blade- rior premolar of Patriofelisferox 



likp fmrl smallpv Thp intprnal Marsh ( type of 0reoc V on latidens 

 HKe ana smaiiei. ine internal Marsh); outer and crown views ; 



CUSp has a thick rounded form, three-fourths natural size. 



and is supported by an independent 



root. The structure of this tooth may therefore be said to be 



distinctly sectorial. 



Numerous other more or less fragmentary remains of this 

 species are contained in the collection, but as they do not add 

 anything to a knowledge of the osteology, which I have already 

 described in considerable detail from the unusually complete 

 skeleton in the American Museum,* their consideration may 

 be here omitted. It is a source of some satisfaction to note 

 that the conclusions which I reached from a study of the rather 

 fragmentary and imperfectly preserved teeth are herewith 

 completely verified. 



In my somewhat exhaustive treatise upon this subject, I 

 was led to express the opinion that these animals were planti- 

 grade, and probably aquatic in habit, pointing out at the same 



* Osteology of Patriofelis, a Middle Eocene Creodont, Bull. Anier. Mus. 

 Sat. Hist,, May, 1894. 



