PLATE XXIII. 



EQUUS BED. 



Fgurel. Equus cumminsii, Cope; external part of superior molar, showing 

 lakes; from the Blanco bed at Mont Blanco; natural size. 



Figures 2-3. Equus semipUcatus, Cope; superior molars, grinding faces ; natural 

 size ; from the Equus bed of Eock Creek. 



Figure 4. Holomeniscus sulcatus, Cope; part of left mandibular ramus support- 

 ing all the molar teeth ; one-half natural size ; a, molar teeth from above ; 

 from the Equus bed of Eock Creek. 



Figure 5. Holomeniscus macrocephalus, Cope; right side of mandible; one-half 

 natural size; a, the same, with symphysis viewed from above. 



[136] 



