Ha'ichf.k : Dkniitions oi- 'l"rrA\(irnKRU'M. 259 



Dkciduous Tr.Kru. 



Deciduous dental fornuila I. |, C. |, j\I. | = 28. 



Superior (/cciJiious tientition : Deciduous i. !- is slightly smaller than 

 d. i.^. Both are very small in the present specimen and on the point 

 of dropping out, though their successors have not yet appeared. The 

 canines have not yet pierced the gums, though their crowns are well 

 formed. They are slightly compressed laterally and exhibit distinctly 

 crenulated and rather sharp anterior and posterior margins. Decidu- 

 ous m. ' is a small tooth fixed in the jaw by two roots, one anterior, 

 the other ]josterior. The latter is much the stronger of the two. 

 There are two external cusps and one internal cusp. The tooth has 

 been some time erui)ted and its crown is much worn, but still shows in 

 the middle a small enamel-covered i)it, a remnant of a median sinus. 

 Deciduous m.^ is a rather large tooth but not entirely molariform. The 

 crown is entirely worn away, not a remnant of its structure being pre- 

 served. There are two distinct external cones and the small remnant 

 of enamel remaining on the inner border of this tooth exhibits a faint 

 inflection near the middle, indicative of a tendency on the part of 

 this tooth toward the true molariform pattern. 



Deciduous m.^ is entirely molariform with two distinct external and 

 internal cones. The structure of the crown of this tooth is likewise 

 much obliterated by w^ear, though not so much as in the preceding 

 tooth. There still persists on the anterior surface a very small enameled 

 pit as a remnant of the anterior valley. 



Deciduous m.:*^ is the largest tooth of the deciduous series. It is 

 less worn than any of the preceding molars. It is quite molariform 

 and is provided with an external basal cingulum, which character is 

 only faintly, or not at all, developed on the ^jreceding teeth. 



Inferior deciduous dentition : The deciduous lower incisors are want- 

 ing in the present specimen, having doubtless been shed, or lost, prior 

 to the death of the animal. The alveoles are still faintly discernible. 

 In a second and younger specimen, No. 117, from the same locality, 

 there are two incisors on either side. These have extremely large 

 crowns, are just in process of eruption, and entirely fill the alveolar 

 margin of the premaxillaries between the unerupted canines. Decidu- 

 ous i.^ is larger and more advanced than is d. i. j. The canines are in 

 about the same stage as are the superior canines and they do not differ 

 materially from the latter. Deciduous m.y is a small trenchant tooth 



