ipoi.] Gidley, The North A luericaii Species of Eqitiis. II3 



are well worn and hence near the stage when the simplest form of 

 tooth pattern would be presented. 



Measurements of type tooth. 



2 j Antero-posterior diameter 32 mm. 



( Transverse " 23 " 



Measurements of Nos, gsoj and g2i'j. 



„ /o /^ T \ i Antero-posterior diameter 25 mm. 



p- (So. Carolina) \ 



( Transverse " 



24 " 



3-5 " 



Transverse " 24. 5 " 



(7) Eqtnis excelsiis Leidy. 



(Florida) ] Antero-posterior " 23.5" 



Type Locality. — Pawnee Loup Branch of the Platte River, Neb. 



Type. — A fragment of the right side of an upper jaw, containing pA - m^ 

 inclusive. 



Authors description. — "About the size of the largest variety of recent 

 horse. . . . The teeth do not differ in constitution from those of the recent 

 horse ; and none of them present a greaterdegreeof complication of the enamel 

 folds on their triturating surface." 



Leidy gave no further identification of this species in his 

 original description, but in his publication, ' The Extinct Mam- 

 malia of Dakota and Nebraska,' 1S69, p. 266, he gave as an 

 additional character, " the absence of the little infolding of the 

 enamel at the bottom of the deep valley between the median and 

 posterior columns of the upper molar teeth " ; and he figured the 

 type specimen on PI, xxi, fig. 31, of that work. 



Measurements of Teeth. 



4 J Antero-posterior diameter 28,5 mm. 



( Transverse " 28.5 " 



1 \ Antero-posterior " 26.5 " 



\ Transverse " 2S.5 " 



o j Antero-posterior " 26.5 " 



( Transverse " 27. " 



3 j Antero-posterior " 26. " 



' Transverse " 19. 



This species, as it now stands, cannot be clearly defined. 

 The type specimen is quite simple in tooth pattern, much more 

 simple than is usual in the teeth of about the same size in the 

 American Museum collection from the Niobrara River locality. 



{May, 1901.] 8 



