■ LISTON: new ()R little known EXlTNCr VERTEBRATES. 



173 



(?) Pog-onodon sp. 



A single mandibular ramus, wanting the posterior part, and of 

 almost the same size as that of D. atrox was found by Mr. B. M. 

 Dickinson, of the University Expedition, near the upper part of the 

 Protoceras beds. It clearly indicates another species, and probably 

 another genus, which I cannot distinguish from Pogonodon. It 

 differs from the corresponding part of D. atrox in having a larger 

 canine, less deep flange, and an additional premolar. The jaw, too, 

 is less slender, the distance between the canine and third premolar is 

 less, and it evidently had a stouter coronoid process, as is shown 

 from the basal portion, which begins to ascend immediately behind 

 the molar, instead of at some distance beyond it. Measurements of 

 the jaw will be found with those of D. atrox. 



Left mandible of Pofronoclon 



two-thirds natural size. 



Dinictis (".') sp. 



A fragment of an upper jaw with three teeth, 

 the crowns of which are shown in the cut, found 

 by Mr. T. R. Overton in the Protoceras beds, 

 seems to indicate a species of Dinictis, but differs 

 in the hitherto unrecorded peculiarity of having 

 two true molars, the second situated back of the 

 middle of the first. The sectorial measures 22 

 millimeters in length by 13 in width; the antero- Dinictis c-i sp. 

 posterior diameter of the first molar is 7 millimeters, K^ NafSrlf si'^ze^ "''' 

 its transverse diameter 15; the second molar has its greatest diameter 

 a little over 3 millimeters and its opposite diameter a little less. 



Left 



