NORTH-CAROLINA GEOLOGICAL SURVEY. 



197 



has not been worn. It resembles a recent tooth, as it is 

 FIG. 19. whitish, and only stained brown on one 



side. The enamel plates, it will be per- 

 ceived differ from the preceding, and they 

 differ also from those of the correspond- 

 ing tooth of the domestic horse. This 

 difference, however, may arise from its 

 unworn condition, as the enamel plates 

 differ somewhat in configuration as they wear down. This 

 tooth is three inches long and one thick. 



FIG. 20. This figure (20) represents the back molar of the 

 left side of the lower jaw of the horse. It differs only 

 slightly from the corresponding tooth of the do- 

 mestic horse. It is worn, but belonged to a young 

 individual, and its roots are undeveloped. It is 

 three inches long, one-half an inch thick, and one 

 and a quarter wide. 



Figure 21 represents one of the incisors of the 



FIG. 21. 



horse ; a, front side ; b, inner side ; c, lateral view. This scarcely 

 differs from the corresponding incisors of the domestic horse. 

 The foregoing teeth are from the miocene of North-Carolina, 

 and were discovered at an early period of the survey. No. 18 

 was found in a bed at Elizabethtown, Bladen county, and was 

 accompanied with a tooth from the lower jaw. No. 19 and 

 20 are teeth washed up on the beach at Plymouth, N. 0., and 



