USE OF CHARTS IN TEACHING VERTEBRATE PALEONTOLOGY 51 
indicate the number and relative proportions of the bones in 
each row. The loss of all or a part of the ulna or fibula may be 
shown by ignoring the outlines of these bones or by using only 
Hind Leg. 
Fig. 1 
those lines bounding the part retained. The fusion of two 
bones is indicated by omitting the division between them. In 
the humerus the presence of the ectepicondylar or entepicondylar 
