hay: on fossil vertebrates. 47 



the lower articular surface, 41.5 mm. A third metacarpal from 

 the same place is larger. The length is 232 mm.; width at the 

 upper end 51.5 mm.; at the middle of the length, 33 mm.; across 

 the lower articular surface 45 mm. 



It seems that two species are indicated here; the latter bone 

 being possibly that of Equus complicatus, the other two those of 

 E. leidyi. 



Besides these there are some phalanges, but none that bore 

 hoofs. There are also two astragali. At least two species of 

 horses ai'e indicated in the phalanges and the astragali. 



There are in the collection also four moderately worn incisors. 



Camelops huerfanensis (Cragin), 



Among the fossils collected on Spring creek are several teeth 

 which the writer can not distinguish from those of the type of 

 Cragin's Camelops huerfanensis, and it was to this species that 

 Cragin himself referred them. These teeth consist of nine in- 

 cisors, foui' canines, three upper second molars, three lower 

 second molars, two lower third molars, two upper milk-molars, 

 and three lower third milk-molars. 



The incisors do not differ fi-om those of specimens found at 

 Minidoka, Idaho (Proc. U. S. Nat. Mus., vol. 46, p. 273, pi. 26, 

 fig. 2). A mature canine, probably of the upper jaw, has the 

 crown bent at right angles with the root and furnished with sharp 

 front and rear edges, as in the lama. Another and stouter canine 

 is somewhat less abruptly bent. 



The least worn second upper molar has a height of 75 mm., a 

 length of 50 mm. on the outer face at the grinding surface, and 

 a length of 45 mm. at a point two-thirds the distance to the root. 

 At the base the width of the anterior lobe is 28 mm., of the posterior 

 26 mm. 



A right second lower molar, slightly worn, has a height of 70 

 mm. (pi. II, fig. 5). Its length at the grinding surface is 47 mm.; 

 at two-thirds the way to the root, 40 mm. The width at the base 

 is 19 mm. There is a well-defined style on the front of the inner 

 face and another on its rear. The two lower last molars furnish 

 the following measurements: 



Measurements of hindermost lower molars in millimeters. 



No. 1. No. 2. 



Height 70 70 



Length near grinding surface 56 62 



Length near the root 60 67 



Width of front lobe near base 20 23 



