OF THE IGUANODON, AND OTHER SAURIAN REMAINS. 
145 
an arduous profession, this memoir is, in all probability, the last contribution which 
it will ever be in my power to offer in this interesting- department of palaeontology. 
I therefore conclude these remarks in the spirit and in the language of the illustrious 
philosopher, whose splendid discoveries and eloquent writings first, drew my atten- 
tion to this branch of natural science, and whose kind and generous assistance so 
often encouraged me to persevere in my investigations: — “ Je termine ici mes travaux, 
et je laisse a mes successeurs a cultiver un champ que je n’ai fait qu’ouvrir, et qui 
bien certainement leur donnera encore des moissons plus riches que toutes celles que 
j’ai pu recueiller*.” 
Crescent Lodge, Clapham Common, 
January, 1841. 
Explanation of the Plates. 
PLATE V. 
Fig. 1. A portion of the right branch of the supposed lower jaw of an Iguanodon, 
viewed on its mesial plane ; of the natural size. 
a a. Dentary bone. 
b b. Opercular bone. 
g g. Alveolar plate or parapet. 
h h. Position of successional teeth. 
i i. Canal for the inferior maxillary vessels and nerves. 
k k. Foramina in the opercular bone. 
Fig. 2. Transverse section of the proximal extremity of figure 1. 
Fig. 3. The right half of the lower jaw of Iguana tuberculata, of the natural size, 
viewed on its mesial aspect. 
a. Dentary bone. 
b. Opercular bone. 
c. Complementary bone. 
d. Surangular bone. 
e. Angular bone. 
f. Articular bone. 
w. Indicates the portion of the jaw which corresponds with the fossil 
represented figs. 1. 8. 
Fig. 4. Magnified view of part of the alveolar parapet of the Iguana, fig. 3, showing 
three teeth anchylosed to its mesial surface, with the external aspect of 
the same, from fig. 7- 
g. Dental parapet. 
* Recherches sur les Oss. Foss., tom. v. p. 526. 
