140 



OSBORN: OLIGOCENE, MIOCENE, PLIOCENE EQUIDiE. 



Type. — Amer. Mus. 9115b. Upper and lower jaws of a young individual with milk dentition, my, preformed, and a 

 few fragments of the skeleton. 



Paratypcs. — Amer. Mus. 9036, 9037, 903S, also probably from Sand Canon, Pawnee Creek beds, Col. 



Fig. 111. Original figures of the type of Protohippus tehoncsis, Merriam, Univ. Cal. Pal. Coll. 21779, ?m 1 . 4a Oc- 

 clusal view, 46 outer view, 4e posterior view. Natural size. After Merriam, 1915, p. 52. 



A/o. 9//S b Type/rev) 

 A . M. 



Protohippu 



ppus p ro p 



.actdu! 



A/o 9/ IS b 7L/pe 

 A. M. 



Protokippus proplacidus 



Fig 112 Protohippus proplacidus Osborn, Amer. Mus. 9115b. (7) Superior deciduous teeth of the type, dp 2 " 4 , 

 and first molar, m 1 . Reversed in drawing. (3) Deciduous inferior teeth of the type, dp 2 ^. All figures natural size. 



Type figure— Plate 25.7, text Fig. 112 of this Memoir. 



Characters.— (Matthew, 1913) from the type and paratypes. (1) Protocone united with protoconule near summit 

 of crown but not strongly united until near the base of the crown; (2) protocone of flattened oval shape; (3) fossette 



