PARAHIPPUS. 



97 



of the median valley in p 3 ; (7) in m 1 median transverse cross crest more sigmoid than in A. equinum; (8) posterior pillar 

 connected with hypocone, with a single enamel loup extending outward; (9) outer crescents with rather faint median ridges. 

 Paratype lower jaw: (1) incisors nearly uniform in size, semi-procumbent; (2) no diastema between incisors and canine; 

 (3) post-canine diastema much longer than in A. equinum; (4) symphysis very long. 



Fig. 72a. Type and paratypes of Parahippus minimus Douglass. Type Carnegie Mus. 713, paratypes 713a, 714. 

 All figures natural size. 



Reference. The type is in the dental stage of Miohippus. The premolars and molars are more primitive than those 

 of Archceohippus or Parahippus. Although recorded from the Madison Valley Lower Pliocene, it may be a case of 

 redeposition from underlying Oligocene. 



