Crocodilus humilis

Leidy, J., 1860, Extinct vertebrata from the Judith River and Great Lignite formations of Nebraska., Transactions of the American Philosophical Society 11, pp. 139-154 : 146

Crocodilus humilis .

With the remains of Trachodon and Deinodon , Dr. Hayden discovered half a dozen teeth , apparently of a small species of Crocodile, though they may probably belong to an acrodont lacertian reptile.

Five of the teeth, ( figures 9— 17, plate 11 ,) are conical and moderately curved; and on their inner part, in front and behind, they present the usual pair of acute ridges. About the middle of the crown, their enamelled surface is slightly folded, especially on the inner side of the teeth. They are solid, except that a small conical cavity occupies the centre of their base. The latter is slightly concave and eroded in appearance; the borders only being broken, indicating that the teeth were about to be shed or actually were so, although most of them appear unworn.

One of the specimens of teeth, ( figures 18, 19 ,) is mammilliform, slightly compressed, and finely rugous in the length of the crown. It is likewise solid, and has the base presenting the same appearance as the other specimens Explanation of Figures, Plate 11.

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Figures 9—19. Teeth of Crocodilus humilis , of the size of Nature.

Figures 9, 10. Inner and lateral views of a conical tooth.

Figure 11. Section of the same at base.

Figures 12, 13. Inner and lateral views of another conical tooth.

Figure 14. Section at base.

Figures 15, 16, 17. Inner, lateral, and sectional views of a third tooth.

Figures 18,19. Outer and lateral views of a mammilliform tooth.

Figures

1-3. Trionyx foveatus 4.Emys obscurus 5-7. Compsemys victus. 9-19 Crocodilus humilis. 20-23. Lepidotus occidentalis. 24-30 Mylognathus priscus