234 



PETRIFACTIONS AND THEIR TEACHINGS. 



CHAP. III. 



LIGN. 49. THE RIGHT RAMUS OF THE LOWER JAW OF THE 



IGUANA TUBEHCULATA. 

 (Presented to the Author by the late Baron Cuvier.) 



1. The right branch of the lower jaw, viewed on its inner aspect: (nat. size.) 



a. Dentary bone. 



b. Opercular bone. 



c. Complementary bone. 



d. Surangular bone. 



e. Angular bone. 

 /. Articular bone. 



2. External view of the same. 



3. Inner aspect of three teeth (magnified') attached to the alveolar parapet, 

 with the germ of a successional tooth at the base of the middle tooth, 

 and the sockets of germs at the bases of the two other mature teeth. 



4. External view of the crowns of three teeth, slightly magnified, in their 

 natural position, appearing above the alveolar ridge. 



