PLATE 34 



LOWER MILK TEETH OF MIOCENE MERYCHIPPUS, PROTOHIPPUS, AND HIPPARION. 



All figures natural size. 



Note the lower, broader crowns in Merychippus^ and the wide separation of metaconid from metastylid in Hipparion. 

 The pattern of the milk teeth in each genus is characteristically like the permanent dentition. Fig. 1 no cement, Fig. 2 a 

 thin cOat, Figs. 3-5 heavily cemented. 



Pawnee Creek, Col. Middle Miocene 1. Merychippus paniensis Cope, referred specimen, Am. Mus. 8290, 



unworn milk premolars (reversed in drawing). 

 " " " " " 2. M. paniensis Cope, referred specimen, Am. Mus. 9403, milk pre- 



molars, well worn. 



Upper Pawnee Creek, Col. Lower Pliocene 3. Protohippus proplacidus Osborn, type, Am. Mus. 9115b, milk premolars, 



little worn. 



Little White River, " " 4. P. placid us Leidy, referred specimen, Am. Mus. 8375, milk teeth, 



So. Dak. a moderately worn. 



" " " " " 5. Hipparion occidental Leidy, referred specimen, Am. Mus. 10579, 



milk teeth, moderately worn (reversed in drawing). 



290 



