PEATE. CLI 
MiocENE CAMELID 
Nomenclature 
Cope 1880-3 Revised 1915 
Protolabis transmontanus Miolabis transmontanus 
Protolabis heterodontus Protolabis heterodontus 
Fics. 1, 2. Miolabis transmontanus (Cope, 1879). Skull, lateral and palatal views, two-thirds 
natural size. Type specimen, Amer. Mus. No. 8196, Cope Coll., from Mascall 
formation of Cottonwood Creek, John Day Valley, Oregon. 
Fias. 3, 4. Prololabis heterodontus (Cope, 1874). Upper and lower jaws, side’ view, and palatal 
view of upper jaw, two-thirds natural size. Type specimen, Amer. Mus. No. 
8296, Cope Coll., from Pawnee Creek beds, near Pawnee Buttes, Weld Co., 
Colorado. 
