102 MEMOIRS OP THE CARNEGIE MUSEUM 



In the sectorial the antero-internal cone is well developed, while the external or 

 principal cone is proportionately a little lower than in Daphosnus or Proamphicyon. 

 The posterior cutting blade is proportionately high. There is a well-developed 

 basal cingulum on the external and anterior borders of this tooth. 



Molar -^- is large and subquadrangular in outline, quite distinct from the same 

 tooth in Daphoenus hartshornianus, as will appear from a comparison of the figure 

 of that tooth shown in PI. XV. with the figures of the same tooth of the last-men- 

 tioned species published by Scott in his " Notes on the Canidse of the White River 

 Oligocene," Fig. A, 2 and PI. XIX., Fig. 2. The structure and form of this tooth 

 is, in fact, intermediate between that of D. hartshornianus and Temnocyon coryphseus, 

 though more closely resembling the latter. The external cusps are subequal and 

 situated well within the external border. The internal cusp is separated from the 

 externals by a deep median valley. The intermediate tubercles are faint. The in- 

 ternal basal cingulum is strong and developed into a prominent cone on the postero- 

 internal angle. There is a basal cingulum on the external border of this tooth. 

 M.-^ is much smaller but of the same general pattern as M.- except that the postero- 

 external cone is much smaller than the antero- and occupies a more external posi- 

 tion than the latter. M.^ is wanting on either side in the present specimen. But on 

 the left side there is preserved what appears to be a single very small alveolus not 

 shown in the figure. This indicates that this tooth may have been present, but if 

 so, was much reduced in size. 



Inferior Dentition. PI. XVI., Fig. 3. 



The incisors are wanting in both rami and hence nothing can be said concerning 

 their character. 



The canine is ci^mpresse 1 laterally but without anterior or posterior trenchant 

 edges. 



The crown of P.y consists of a compressed cone, elliptical in cross-section and 

 directed strongly forward. It is fixed in the jaw by one root. 



The succeeding premolars are each supported by two fangs and the crowns grow 

 successively stronger from the s3Cond to the fourth. They are not re luced in size 

 and separated by but slight diastemata. All bear well-developei ba^al cingula on 

 their posterior borders, and in addition to the principal median cone there is present 

 on P.J a prominent posterior conule. 



The inferior sectorial, M.^ consists of a prominent anterior trigon and a low 

 basal heel. The external cone of the trigon is the strongest and higliest, while the 

 postero- and antero-internal cones are smaller and subequal in height and strength. 



