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 ab- 

 sent, the second tarsale is small. Hallopus (Fig. 155 b), usually re- 



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. 



f erred to the Dinosauria, also has a heel-like calcaneum, as is the 

 case in Scleromochlus, and other genera of the Pseudosuchia, Arae- 

 oscelis (Fig. 155 a), Broomia (Fig. 137 d), and other leaping or 

 springing reptiles. 



