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192
THE OSTEOLOGY OF THE REPTILES
The calcaneum of the Crocodilia (Fig. 157 a, b) is produced into a heel-like process; the first and fifth tarsalia and the centrale are absent, the second tarsale is small. Hallopus (Fig. 155 b), usually referred to the Dinosauria, also has a heel-like calcaneum, as is the case in Scleromochlus, and other genera of the Pseudosuchia, Araeoscelis (Fig. 155 a), Broomia (Fig. 137 d), and other leaping or springing reptiles.
![](http://upload.wikimedia.org/wikipedia/commons/thumb/b/bf/The_Osteology_of_the_Reptiles_p192.png/400px-The_Osteology_of_the_Reptiles_p192.png)
Fig. 157. Crocodilian limbs: A, B, left hind limb of Alligator, dorsal and postaxial; C, left femur dorsal; D, Alligatorellus. After Lortet. About three fourths natural size.