100 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 58. 



There are also several loose upper teeth which are helieved to 

 belong to the same species. Figure 13 (Cat. No. 9172) is from an 

 upper premolar, thought to be the second of the right side. Its 

 length is 10 mm. ; its width 9 mm. Figure 9 (Cat. No. 9173) presents 

 a view of an upper right premolar, apparently the fourth ; but it is 

 somewhat smaller than that of figure 8. It is but little worn and 

 is 12.5 mm. long and 11.6 mm. wide. Figure 10 (Cat. No. 9174) rep- 

 resents an upper left fourth premolar hardly touched by wear. It 

 is 13.5 mm. long and 13 mm. wide. An upper left first molar (Cat. 

 No. 9175) considerably worn is shown by figure 11. It is 14 mm. 

 long and 14 mm. wide. An upper right second molar (Cat. No. 9176) 

 furnishes figure 12. It is wholly untouched by wear and presents the 

 roots. It is 16 mm. long and 14 mm. wide. Inasmuch as it presents 

 a distinct central tubercle and a slight external cingulum it is possi- 

 ble that it belongs to another species. 



MYLOHYUS OBTUSIDENS, new species. 



Plate 4, figs. 14-15. 



Types or species. — A complete upper canine, and the crown of a 

 lower one (Cat. No. 9186). 



Type locality. — Western Maryland. 



Type formation. — Pleistocene. 



Diagnosis. — Canines, upper and lower, with front and rear bor- 

 ders obtuse. Enamel smooth. 



The two canines of the left side (Cat. No. 9186) which are made 

 the type of this supposed new species are considerably worn. It 

 seems probable that they belonged to the same individual, inasmuch 

 as the worn surfaces fit accurately together. The upper canine (pi. 

 4, fig. 14) presents the tooth in the condition it had when the animal 

 died. The crown has a height of 35 mm. The height of the whole 

 tooth, measured along the anterior border, is 95 mm. At the base of 

 the crown the fore-and-aft diameter is 15 mm.; the side-to-side 

 diameter 11 mm. As far as preserved, the anterior border is broadly 

 rounded, the posterior border somewhat less so. Even toward the 

 tip of the tooth there is no indication of a hinder sharp edge. 



The lower canine (pi. 4, fig. 15), broken off at the base of the 

 crown, has there a fore-and-aft diameter of 12 mm., a transverse 

 diameter of 9.6 mm. The front is broadly rounded. On the hinder 

 face there is an indication of a shallow groove; on the outer face a 

 mere trace of a narrow one. The enamel of both canines is smooth 

 and polished. 



There is present a fragment, 40 mm. long, of another and smaller 

 lower canine (Cat. No. 9187), which belonged probably to a female. 

 At the base of the crown the fore-and-aft diameter is 10 mm. ; the 



