No. 2328. PLEISTOCENE VERTEBRATES IN UNITED STATES— HAY. 119 



13 loAver teeth, premolars and molars (Cat. No. 9100). Three teeth 

 (Cat. No. 9101) are the premolars of the right side of the lower jaw 

 and are here illustrated (pi. 7, fig. 1). 



EQUUS LAURENTIUS Hay. 



To this species are referred six upper premolars and molars (Cat- 

 No. 9102). They are all well-preserved teeth, mostly not much worn. 

 Similarly preserved lower teeth, 12 in number (Cat. No. 9103), are 

 referred provisionally to the species ; but they, or some of them, may 

 belong with the upper molar here identified as E. excelsus. 



EQUUS EXCELSUS Leidy. 



An upper tooth (Cat. No. 9106), probably a fourth premolar, is 

 identified provisionally as that of Equus excelsus. The enamel sur- 

 rounding the fossettes is little plicated. The crown is 70 mm. high, 

 27 mm. long, and 26 mm. wide, and it is considerably curved. An 

 upper tooth (Cat. No. 9105), apparently the first molar, is 60 mm, 

 high, 24.5 mm. long, and 26.6 mm. wide. Another tooth, now in 

 the department of anthropology, is referred to the same species. It 

 is considerably curved, so that the outer and the front faces are 

 convex. It is not unlikely that some lower teeth belong here. 



EQUUS HATCHERI Hay. 



Plate 7, fig. 2. 

 A single tooth (Cat. No. 9107) is recognized as belonging to this 

 species. A view of a cross section is given (pi. 7, fig. 2). This is 

 taken at the middle of the height of the crown. The length is 28 

 mm. ; the width, 28 mm. It will be observed that the enamel is con- 

 siderably plicated. The tooth appears to be a first or a second upper 

 molar. 



EQUUS HOLMESI. new species. 



Plate 7, figs. 9-12. 



Ty2)e specimen. — Four upper teeth of the right side — namely, pre- 

 molars 3 and 4, molars 1 and 2. Cat. No. 8642, U. S. National 

 Museum. 



2'ype locality. — Northeastern Oklahoma. 



Type formation. — Pleistocene. 



Diagnosis. — Teeth large. Enamel of fossettes, with only medium 

 complication ; styles unusually broad. 



In the department of paleontology are four upper teeth which 

 have the catalogue number 8642. Four similar teeth have been re- 

 tained in the department of anthropology. These all appear to have 

 belonged to the same individual. Those in the department of 

 paleontology consist of the third and fourth premolars and the first 

 and second molars, all of the right side. Two of those in the depart- 



