SUBORDER A 



CHEODONTIA 



55 



Tritemnodon Matthew (Stypolophus Cope 

 tubercles of superior molars closely connate. 

 agilis Marsh sp. Bridger 

 beds. 



Metasinopa Schlosser. 

 Only M^ with metaconid. 

 Talonid trenchant. Oli- 

 gocene ; Egypt. 



Proviverra Riiti- 

 meyer. P short but 

 high. Talonid large, con- 

 cave. Outer tubercles 

 of superior molars well 

 separated. Middle 

 Eocene ; Bohnerz of 

 Egerkingen. 



Cijnolujaenodon Filhol 

 (Fig. 80). Outer tuber- 

 cles of upper molars 

 closely . approximated. 

 Quercy Phosphorites. 



Prorhizaena Riiti- 

 meyer. Known only by 

 upper dentition, M^ not 

 reduced. Bohnerz of 

 Egerkingen. 



Limnpcijon Marsh). External 

 Talonid small, trenchant. T. 



Cynohyaenodon cayluxi Filhol. Phosphorites of Quercy. A, B, Superior 



and inferior aspect of skull. 2/3. (After Gaudry and Filhol.) oc, Supra- 



/y J ji J -131 • •■i-i occipital; Pa, parietal; Fr, frontal; Ju, jugal ; Sq, squamosal; La, 



(xCioetnylaX aiSilUYniG. lachrymal ; Na, nasal ; Mx, maxilla ; Pmx, premaxilla ; crs, sagittal crest ; m, 



Calcaire Grossier ; Paris J^fector\°ob°e"s°'*'' ''' '"'''^''''''^'' °^' "p*"'' '°^'^'' '^' °«^«^'^"'"; ""^' 

 basin. 



Quercytherium Filhol. P strongly thickened. Quercy Phosphorites. 



3-2 



M. 



Subfamily 2. 

 All molars trenchant. 



Hyaenodontinae. 



Superior molars with prolonged metastyle 



3 



and reduced paracone, at times lacking protocone. Inferior molars without 

 metaconid, talonid small or wanting. P^ higher than My Body Stout, extremities 

 with heavy claws and adapted for running. 



The Uyaenodontinae are probably an offshoot of the Proviverrinae, from 

 which they are distinguished by having trenchant M. They appear in 

 Europe in the early Eocene, in North America and Africa in the Oligocene. 



Pterodon Blainville (Hemipsalodon Cope) (Fig. 81). Molars f. M'^ and il/- 

 with closely compressed outer cusps and strong protocone. AP transversely 

 placed. Inferior molars with high, thick protoconid, robust paraconid and 

 rudimentary talonid. P simple, thickened, P^ and lower first incisor 

 frequently missing. Canines strongly developed. Cranium heavy, muzzle 

 abbreviated. Calcaire Grossier of Paris ; D^bruge, Isle of Wight, and 

 Quercy Phosphorites in the Upper Eocene. P. dasyuroides Gerv. Oligocene. 

 P. grandis Cope ; P. africanus Andrews. White River beds of Canada and 

 Oligocene of Egypt respectively. They are the size of a tiger. 



