CONTENTS 



Page 



Introduction '. 1 



Geologic distribution 4 



Geologic background 7 



Geographic distribution by genera 10 



Geographic distribution by states 13 



Alphabetical list of genera and species 18 



Origin, relationships, and phylogeny 22 



General statement 22 



Origin 22 



Classification and relationship 23 



Summary of generic characters 24 



Relationship of genera and polyphyletic development 25 



Systematic description of genera and species 31 



Family Merycoidodon tidae 31 



Genus Protoreodon (syn. Eomeryx, Agriotherium) 31 



Protoreodon medius 33 



Protoreodon minor 34 



Protoreodon paradoxicus 35 



Protoreodon parvus 37 



Protoreodon pumilus 37 



Protoreodon species 39 



Genus Hyomeryx 40 



Hyomeryx breviceps 40 



Genus Bathygenys 41 



Bathygenys alpha 41 



Genus Oreonetes 42 



Oreonetes anceps 43 



Genus Limnenetes 44 



Limnenetes platyceps 44 



Genus Merycoidodon (syn. Oreodon, Cotylops) 45 



Merycoidodon affinis 46 



Merycoidodon culbertsonii 47 



Merycoidodon culbertsonii periculorum 55 



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