f903-] 



Gidley, A New Three- Toed Horse. 



469 



broad and its borders are not clearly defined. The anterior 

 palatal foramina are small and do not extend back of the 

 canines. The anterior border of the posterior narial notch is 

 opposite the middle of m- . The vomer overlaps the anterior 

 end of the basisphenoid. 



M easurements of Teeth. 



Anteroposterior. 

 Diameters of p' 9.5 mm. 



m-. 

 m\ 



29-5 



25 



25 



22 



24 



Total length of series 152 



Width across external incisors 55 



Anteroposterior diameter of protocone, p- 8 



P^ 



P* 



mm. 



Anteroposterior. 

 Diameters of po 24 mm. 



P3- 



P4 • 



mj. 

 in, . 

 m„ , 



25 

 25 

 24 



255 

 22 



9-5 

 10.5 " 



9 



9-5 " 

 10.5 " 



Transverse. 

 1 1.5 mm. 



13 



9-5 

 75 



Milk dcnlilion {Upper) 



Anteroposterior. 



Diameters of dp- 3 t -.S mm. 21.5 



" dp^* 26 " 21 



" dp* 2() " 20 



Skull Measurements. 



Total length of skull 37^ 



" palate 205 



Width of palate between first molars 44 



at narrowest point 20 



Length of diastema between canine and external incisor 20 

 " " " " external incisor anil ]>'.. . 67.5 



Greatest width of posterior nares 28 



Width of skull 128 



" " condyles 54 



Transverse. 

 2 1 . s mm . 



