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Sxix 
DESCRIPTION OF PLATE VI. 
Tilustrative of the Structure of Fossil Teeth. 
Fig. la.—Tooth of Psammodus porosus, from the Mountain Limestone. See 
p. 587. 
1b.—Vertical section, a portion x 75 linear. 
1e.—Transverse section of the same, x 75. 
24.—Tooth of Ptychodus polygurus, from the Chalk, near Lewes. See p. 585. 
2b.—Portion of longitudinal section, x 20. 
2c.—Portion of transverse section, x 20. 
3¢,—Tooth of the Labyrinthodon Jegeri, from the New Red sandstone near 
Wirtemberg; half the natural size: the specimen presented by 
Dr. Jeger. See p. 742. 
34,—A moiety of a transverse polished section, x 20. 
3b.—Portion of a vertical section near the apex, x 20. 
3c.—One of the anfractuosities of fig. 3a x x. 
4a,—Crown or upper portion of a tooth of a young Iguanodon, from Tilgate 
Forest. See p. 697. . 
4b.—Portion of a vertical section of the above, x 20. 
4c,—A small portion of a transverse section of the same, x 20. 
5.—Tooth of Goniopholis, Tilgate Forest: half the natural size. See p. 678. 
62.—Tooth of a reptile (probably of the Hy/@osaurus), from Tilgate Forest ; 
half the natural size. See p. 690. 
6,—Portion of a vertical section of the same, x 20. 
74,—Tooth of Megalosaurus, from Tilgate Forest. See p. 687. 
76,—Portion of a vertical section of the same, x 10. 
8.—A small portion of a vertical section of a tooth of Dendrodus. See p. 618. 
9.—Portion of a transverse section of the base of a tooth of Ichthyosaurus, 
x 20. See p. 665. 
10a.—Tooth of Lepidotus, Tilgate Forest. See p. 606. 
10%,—The upper figure is a transverse section, and the lower a vertical 
section of the same, x 20. 
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