DESCRIPTION OF THE PLATES. 



PLATE 65 B. 



Fig. 1 . — Half of a transverse section of the 

 tooth of a Python, magnified 1 20 linear 

 times ; a, pulp-cavity ; b, peripheral part of 

 dentine ; c, enamel. Fig. 2. Dentinal 

 tubes of ditto, magnified 500 linear diame- 

 ters. Fig. 3. Section of the base of a 

 tooth of the Iguana tuberculata, magnified 

 350 linear diameters. Original. 



PLATE 66. 



Fig. 1. — Uromastyx. 1\ Inside view of 

 two of the anchylosed teeth, and their 

 transverse section. Fig. 2. Lacerta ocel- 

 lata. 2", magnified tooth and transverse 

 section. Fig. 3. Chameleo bifurcus. 3*. 

 Inside view of an anchylosed tooth. Fig. 4. 

 Gecko (Thecodactylus lavis). 4\ Single 

 tooth. Fig. 5. Lower jaw of a large species 

 of Scincus. 5". One of the teeth magni- 

 fied. Cuvier. Fig. 6. Thorictes Dracana, 

 upper and lower jaws. Fig. 7. Cyclodus 

 nigroluteus, b b, successional teeth. In 

 each of the above -figures, a, is the 

 intermaxillary ; b, maxillary ; c, dentary ; 

 d. articular ; e, angular ; /, surangular ; 

 g, coronoid ; h, splenial or opercular. 

 Original. 



PLATE 67. 



Fia. 1. — Longitudinal section of a tooth 

 and portion of the alveolar parapet of a 

 Monitor Lizard (Varanus), magnified 250 

 linear diameters, a, Enamel ; b, dentine ; 

 c, bone ; d, vascular canals. Fig. 2. A 

 small portion from the exterior of the 

 same tooth, magnified 500 linear times. 

 a, Enamel ; b, dentine, showing the small 

 lateral branches of the tubes. 



PLATE 68. 



Fig. 1. — A greatly reduced view of the fossil 

 jaws of the MosasaurusHoffmanni: b, supe- 



rior maxillary ; d, d, pterygoid bones and 

 teetb. Fig. 2. Half the base of the skull 

 of the Iguana tuberculata : a, intermaxil- 

 lary ; b, maxillary ; c, palatine ; d, ptery- 

 goid or ento-pterygoid ; e, transverse or 

 exo- pterygoid bones ; /, process of ento- 

 pterygoid ; g, basi-sphenoid ; h, basi- 

 occipital. Fig. 3. Lower jaw of Varanus 

 crocodilinus : c, dentary ; d, articular ; 

 f, sur-angular ; g, coronoid ; h, splenial. 

 Fig. 3 1 . A single tooth magnified, of the 

 same. Fig. 4. Inside view of lower jaw 

 of the Varanus niloticus. 4 1 . A single 

 tooth magnified, of the same. Fig. 5. Outer 

 side of crown of tooth of Pliosaurus. 5 

 & 5". The two other sides of the same 

 trihedral crown. 



PLATE 69. 



Fig. 1. — Portion of a transverse section 

 of the crown of the maxillary tooth 

 of the Iguana tuberculata: a, enamel, 

 b, dentine ; * magnified 350 linear dia- 

 meters. Fig. 2. The termination of a 

 single dentinal tube, magnified 500 linear 

 diameters. Fig. 3. A reduced view of 

 half a transverse section of a maxillary 

 tooth of the Mosasaurus, magnified 230 

 linear diameters, a, enamel ; b, dentine. 

 Original. 



PLATE 70. 



Fig. 1. — Tooth of the Iguanodon, outer 

 side. Fig. 2. The same, inner side. 

 Fig. 3. Fragment of an old tooth much 

 worn down. Fig. 4. Tooth of a young 

 Iguanodon. Fig. 5. Crown of an incom- 

 pletely formed successional tooth of Igua- 

 nodon. Fig. 6. Skull of the Iguana 

 cornuta. Fig. 7. Inside view of lower jaw 

 of ditto, showing the pleurodont mode of 

 attachment of the teeth and the germs of 

 their successors. Fig. 8. Reduced view 

 of portion of the lower jaw of the Mega- 



