67 



Ursus Gray. Myrmarctos Gray. 



Tremarctos Gerv. 

 Helarctos Horsf. 



.2. 

 Melursus Meyer=ProcAt7us 111. 



Extinct Ursidae? 

 (Family? Hycenaretidae ?) 



Hyanarctos Caatl. and F&\c.=Ayriotherium W&gn.=Sivalarcto--Amphiarctos Blainv. 

 =Hemicyon Lartet. 



XVIII. AELURIDAE. 

 Gemts. 



Aelurus F. Cuv. 



XIX. CERCOLEPTIDAE. 



Genus. 

 Cercoleptes l\liger=Kinkojou La.c.=Potos Cuv.=Caudivolvulvs Desm. 



XX. PROCYONIDAE. 



BUB-FAMILIES. 



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

 forwards and towards the external auditory meatus. Mastoid process little 

 developed, extrorse behind meatus. 



NASTTINAB. (A.) 



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

 ally towards the external auditory meatus. Mastoid process enlarged and 

 prolonged downwards. 



PBOCTONINAB. (B.) 

 A. NASUIH AE. 



Nasua Sion=Coati Lac. 



B. PBOCTONINAB. 



Procyon Storr. 



Procyonidae? of extinct genera. 

 Tylodon Gerv. 

 Leptarcios Leidy. 



XXI. BASSABIDIDAE. 



Genut. 

 Bastarit Licht. 



FISSIPEDIA INCERTAE SESI8. 

 XXII. SIMOCYONIDAJE. 



Extinct. 

 Simocyon K&up=Diaphorus Gaudry.. 



