Marsh Collection, Peabody Museum. 203 



another germs, but another family. It is therefore the type of 

 the genus and species under consideration. The specimen con- 

 sists of an incomplete mandibular ramus containing the decid- 

 uous canine, second and third deciduous molars, the alveolus 

 for the first, and the crown of the first permanent molar, 

 which was just being erupted. Imme- 

 diately posterior to this tooth is seen a 4l 

 part of the bony crypt which lodged the 

 imperfectly calcified germ of a second 

 molar, so that the inferior molar and 

 premolar formula can be determined. 

 The three deciduous molars imply a like 

 number of permanent premolars, and as Figure 41. — Crown 

 there is evidence of no more than two view of first lower molar 

 molars, we may fairly assume that the &£ *£*£( \Y,? 

 number was two. I he formula would (Type) 

 then be I. (?), C. T , Pm. ¥ , M. ¥ . 



The deciduous canine was not fully erupted and the point 

 of the crown is missing. Like the corresponding milk tooth 

 of the lion, the root is considerably compressed from side to 

 side and of great anteroposterior diameter. The crown is 

 small in comparison with the root, and the enamel extends 

 much further down on the buccal than upon the lingual side 

 of the crown. There is a deep vertical sulcus, flanked by a dis- 

 tinct ridge in front, on the inner face, the base of the crown, 

 which is surrounded by a distinct cingulum. 



The first deciduous molar, as indicated by its alveolus, is 

 placed behind the canine without diastema, somewhat internal 

 to the tooth line and slightly overlapping the second tooth. 

 The tooth was small and single-rooted. The second tooth is 

 abruptly larger ; it is implanted by two strong roots and has a 

 crown composed of a large, laterally compressed, central cusp, 

 with strong anterior and posterior cusps. There is no basal cin- 

 gulum. In structure, this tooth agrees very closely with that 

 of the lion. 



The crown of the third deciduous molar is much damaged 

 and does not display its structure satisfactorily. Enough 

 remains, however, to enable me to state that its crown was 

 thoroughly sectorial in organization. The anterior blade is 

 preserved and is rather short antero-posteriorly. The great 

 proportional length which remains indicates without much 

 doubt that there was a rather large heel and probably an inter- 

 nal cusp as well. In the milk sectorial of the lion both these 

 elements are present ; and as far as this tooth is preserved in 

 the fossil, its resemblance to that of the cats is much more 

 marked that it is to any other family of the Carnassidentia. 



