SUBORDER A 



CREODONTIA 



57 



3P with more or less fused paracone and raetacone and rudimentary 

 protocone, which is lacking on ilf ^ ; M^ wanting. M^ and M^ with short 

 protoconid and rudimentary talonid, which is lacking in Tlfg, but the proto- 

 conid is developed as a long blade, as is the metastyle of the superior 

 molars. Cranium and extremities long and slender, or short and thickened. 

 Humerus with prominent trochlea ; first digit often reduced. Rather 

 abundant in the Bohnerz of Egerkingen, Upper Eocene Phosphorites, 

 Gypsum Beds of Paris, Lignite of D6bruge, Euzet les Bains (Gard). 

 H. reqideni Gerv. is represented by numerous varieties in the Phosphorites, 

 and the Oligocene of Ronzon and Cournon. H. horriclus Leidy well represented 

 in White River Oligocene of North America. 



Tribe 3. EUCREODI. 



P^ and M^ may he developed as carnassial teeth. Claws compressed and not 

 cleft. Manus and pes almost paraxonic. Fibula not articulating with calcaneum. 

 Zijgapophyses of lumbar vertebrae flattened. 



Family 5. Arctocyonidae Gervais. 



|7If. 



No carnassial teeth, molars low, upper molars multitubercular. Lower 

 molars with large talonid and reduced paraconid. P sihple, diminutive. Extremities 

 plantigrade, pentadactyl. Centrale fused with scaphoid. 



The Arctocyonidae are omnivorous creodonts, with sharp canine teeth, 

 and resemble the Ursidae in many respects, apparently undergoing a similar 



specialisation from the Creodont stem. They 

 occur in the basal Eocene of Rheims, and in 

 North America in the Torrejon, Fort Union, 

 and Wasatch beds. 



Fig. S3. 



Arctocyon primaevus Blainv. 

 Eocene ; La Fere near Rheims. 

 1/3. (After Gaudry.) t 



Lower 



Skull. 



Fig. 84. 



Arctocyoyi gervaisi Lemoine. Lower Eocene ; 

 Cernays near Rheims. .4, Inferior aspect of 3 

 upper molars, i/i- -S, Superior and lateral aspect 

 of lower molars, i/i. (After Lemoine.) 



Arctocyon Blv. (Fig. 83). Upper molars with five to six tubercles. 

 C long, slender, serrated posteriorly. Basal Eocene ; Cernays, near Rheims. 



