76 memoirs of the carnegie museum 



Measurements. 



Length from condyle to incisive alveolar border 152 mm. 



Height of condyle above angular proce«s 30 " 



" " coronoid " " " 68 " 



Width of coronoid at summit 26 " 



Depth of ramus below middle of sectorial 26 " 



" " ramus below P. T 21 " 



The Teeth. 



The dental formula is I.f, C. \, P.|, M.f — 44. All the teeth are represented in 

 our specimens and in good preservation except the incisors, P.- and j and M.-^, 

 these are shown only by the alveoli or roots in either jaw of our skulls. By mistake 

 the superior incisors and P.- were shaded in from a third skull belonging to a dis- 

 tinct species in the drawing reproduced in Plate XVI., Fig. 5. 



Superior Dentition. — PL XVI., Fig. 5. The incisive alveolar border extends 

 nearly at right angles to the longer axis of the skull. Only the roots of the incisors 

 are preserved. These show that I.- and - were small, very much compressed lat- 

 erally and subequal in size, while I.^, although small as compared with the same 

 tooth in recent dogs, was much stronger than the two preceding teeth, a character 

 not shown in the illustration, which is erroneous in that respect. Between I.^ and 

 the canine there is in the premaxillary a deep depression into which fitted the point 

 of the inferior canine. 



The canines are blunt, stout, and without anterior or posterior serrated or cutting 

 edges. They are fixed in the jaw by large fangs and are directed downward, for- 

 ward and outward. 



P.- is represented only by the fang. It was fixed in the jaw by only a single 

 root and its crown was probably not very different from that shown in the drawing. 

 It was separated from the canine and from P.- by considerable diastemata. 



P.- has two roots and a single median cusp. The transverse diameters of the 

 anterior and posterior portions of the crown are subequal. Its longer diameter is 

 parallel with that of the skull. A short diastema separates this tooth from the suc- 

 ceeding premolar. 



The crown of P.- supports a single median cusp with a low, broad heel posteri- 

 orly and a much narrower anterior portion. There is a rather well-defined basal 

 cingulum along the internal and posterior borders, of this tooth. There is no dias- 

 tema between P.^ and the superior sectorial. At the anterior margin of P.- the 

 alveolar border assumes a direction somewhat oblique to that of the longer axis of 

 the skull which allows the palate to broaden posteriorly. 



