ocr: America. 2. Orohippus pumilus (or-0-hip-us pew-mi-lus) "mountain horse." 1 Lived forty-nine million years ago in North America. 3. Mesohippus bairdit (mez-o-hip-us bear-de-1) middle horse. n Lived thirty-three million years ago in North America. 4. Mtohappus intermedius (mi- 0-hip-us in-ter-me-de-us) "Miocene horse. - Lived thirty million years ago in North America. 5. Kalobatippus agatensis (kal-o-balh-tip-us ag-it-en-sis) "stiltwalking horse." e Lived twenty-two million years ago in midcontinent North America. 6. Hypohippus osbornt hi-po-hip-us OZ- born-i) "below horse." Lived fifteen millio ...