BY N. DE MIKLOUIIO-MACLAY. 577 



Fig. 10, A'.-E'. — Permanent premolar of the lower jaw. {Twice the 

 natural size.) 

 A'. — View from above. 

 B'. — View from outside. 

 C — View from inside. 

 D'. — View from the front. 

 E'. — View from behind. 



Fig. 10. — Crown of the upper molar from below, to show the ridging. 

 ( Twice the natural size.) 



Fig. 11. — Corresponding mandibular molar, to show the ridging of the 

 crown, from above. {Twice the natural size.) 



The same lettering in all the figures. 



i. — Incisors. 



c. — Canines. 



tp. — Temporary premolars. 



tm. — Temporary molars. 



m. — Molars. 



fc. — Formative cells. 



