SKELETON. 

 Fig. 18. 



43 



Pelvis and hind limb of 

 Discoglossus pictus. 



a. Astragalus. 



c. Oalcaneuni. 



/. Femur. 



il. Ilium. 



is. Ischium. 



p. Pubis. 



t. Tibia-fibula. 



the pubis is represented by a 

 small ossified nodule, not enter- 

 ing the acetabulum. In the 

 Discoglossidse the acetabulum 

 remains open, as in the young 

 of other Batrachians. 



The femur is more or less 

 strongly curved. The tibia 

 and fibula are fused to a 



single nearly straight bone. The epiphyses of these 



bones remain cartilaginous in the Discoglossidse and 



Pelohatidas, calcify in the other families. 



The tarsus is remarkable for the elongation of the 



astragalus and calcaneum, which form an additional 



