D e^ra-yyiel 



de-Kvitvie 



l3 ce^rte-yvt 



cavity 



Fiji. .SO. Incisor tcetli showing diffoivnt degroos of specialization. Natural .size 



A. IVrinanent tooth of youns cow. a, crown; />, base of crown; r, root 



B. Deciduous tooth of colt 4 day.s oltl. a, crown; />, base of crown; r, incomplete root ; 

 (/, bottom of shallow cul-de-sac; e, enamel; /, cement deposited on enamel 



C. Permanent tooth of colt 2 years old. a, crown; f/, bottom of very deep cul-de-sac; e, 

 enamel; /, cement 



D. Side view of C. (.\, B, and C, inner views) 



LJ ert-wmel 

 ^ dertiiyve 

 E^ ceyne-yvt 

 ■ yu<xtx*r-at 

 cavity 



Inner 



view. 



Incisor teeth of the permanent set (z. 

 Natural size 



) showing wear and movement. 



A. Tooth of a colt 2 years old before it has erupted, e, folded edge of enamel, unworn 



B. Tooth of horse 4 years old, a, crown; h, base of crown; c, incompleted root; d, bottom of 

 cul-de-sac; e, worn edges of enamel; &, gum line 



C. Tooth of horse 12 years old. c, root fully grown; /, internal and external cement; h, nerve 

 foramen; i, natural cavity in cement 



D. Tooth of horse 17 years old. j, "dental star" 



E. Tooth of horse 33 years old 



49 



