67 



C7rsus Gray. Myrmarctos Gray. 



Tremarctos Gerv* 

 Helarctos Horsf. 



.2. 

 Melursus Meyer=Prochilus 111. 



Extinct Ursidae f 

 (Family? Hycenarctidae?) 



Hyunarctos Caatl. and F&\c.=Agriotherium W&gn.=Sivalarctos-\-Amphiarctos Blainv. 

 =Hemicyon Lartet. 



XVIII. AELTJRIDAE. 



Genus. 

 Aelurus F. Cuv. 



XIX. CERCOLEPTIDAE. 



Genus. 

 Cercoleptes I\ligeT=Kinkojou La.c.=Potos Cuv.=Caudivolvulus Desm. 



XX. PROCYONIDAE. 



SUB-FAMILIES. 



I. Snout attenuated. Auditory bulla small, abruptly contracted, flattened 

 forwards and towards the external auditory uieatus. Mastoid process little 

 developed, extrorse behind ineatus. 



NASUINAB. (A.) 



II. Snout comparatively abbreviated. Auditory bulla large, sloping gradu- 

 ally towards the external auditory meatus. Mastoid process enlarged and 

 prolonged downwards. 



PROCYONINAE. (B.) 

 A. NASUINA.E. 



Nasua Storr=Coafi Lac. 



B. PBOCYONINAE. 



Procyon Storr. 



Procyonidae? of extinct genera. 

 Tylodon Gerv. 

 Leptarcios Leidy. 



XXI. BAS8ABIDIDAE. 



Genus. 

 Bastaris Licht. 



FISSIPEDIA INCERTAE 8EDIS. 

 XXII. SIMOCYONIDAE. 



Extinct. 

 Simocyon Kaup=Z)/apAorus Gaudry. 



