igoi.] Gidley, The North American Species of Eqiius. 97 



Fig. 3. Superior molars of Eguus comflicatus, sectioned to illustrate changes in dimensions and 

 pattern at different stages of wear. A, triturating surface of m^. .4 \ A"^ , and A^, sections cut 

 parallel to triturating surface. A'^ shows where sections were cut ; B, triturating surface of m^ ; j9', sec- 

 tion ; B"^ shows where section was taken. 



{ilay, 1001.] 



