OSTEOLOGY OF CARNIVOROUS DINOSAURS. 



Ill 



Astragalus and calcaneum (as. and ca.). — The right astragalus and calcaneum, 

 firmly fused with one another and closely adjoined with the distal ends of the tibia 

 and fibula, were found as shown in figure 65. These bones have been carefully 



Fig. 65. — Right tibia, fibula, astragalus, and calcaneum of Ceratosaurus nasicornis Marsh. No. 4735, TJ.S.N.M 

 J NAT. SIZE. A, front; .B, outer; C, back views; As, astragalus; Ca, calcaneum; F, fibula; T, tibia. 



compared with the homologous elements of Antrodemus, and I fail to find any very 

 distinctive differences, except their smaller size. The astragalus has a prominent 

 ascending process, which appears to be of about the same relative proportions as 

 in Antrodemus, except that the ascending process is shorter. 



