PLATE 17. 



UPPER TEETH OF MERYCHIPPUS. 



COMPARISON OF VARIOUS SPECIES FROM THE MIOCENE AND LOWER PLIOCENE FORMATIONS OF THE WESTERN 



UNITED STATES. 



All figures natural size. 



Mascall, Cottonwood Creek, Ore. Middle Miocene 1. Merychippus seversus Cope, type, Am. Mus. 8180, (?) of the 



right side (reversed in drawing). Little worn. 



?Mascall, Oregon Desert, Ore. ?Middle 2. M. relictus Cope, type, Am. Mus. 8673, upper molar of the 



right side. Much worn. 



Deep River, Mont. Middle 3. M. isonesus Cope, referred specimen, Am. Mus. 8105. Much 



worn. 



Mascall, Cottonwood Creek, Ore. " " 4. M. isonesus Cope, type, Am. Mus. 8175. 



Niobrara River, Nebr. Lower Pliocene 5. Merychippus insignis Leidy, referred specimen. 



Republican River, Nebr. " " 6. M. patruus Osborn, type, Am. Mus. 8347a. Upper teeth, 



moderately worn. 



Driftwood Creek, Nebr. " " 7. M. republieanus Osborn, type, Am. Mus. 8347, upper teeth, 



moderately worn. (This is the specimen figured by Cope 

 under the name Hippotherium speciosum.) 



Snake Creek, Sioux County, Nebr. ?Lower Pliocene 8. M. ealamarius Cope, referred specimen, Am. Mus. 14003. 



P 2 and m 3 are drawn from other (unnumbered) individuals 

 from the same quarry. (M 3 reversed in drawing.) 



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