76 



ZOOLOGY. 



all the connective tissue is gone, the distinction cannot 

 be recognized. 



The right and left pubes are joined in the middle central 

 line, but a narrow strip of cartilage persists between the 



Fig. 42. FEMUR, TIBIA, AND FIBULA. 



Fig. 43. TARSALS, METATARSALS, 

 AND PHALANGES. 



two actual bones : such a persistent cartilage in the middle 

 line, joining the right and left bones of a pair, is called a 

 symphysis. 



13. The Hind-limb (fig. 42 and fig. 43.) The first 

 bone, or femur, differs from the humerus in the greater 

 distinctness of its articulating head, and the greater pro- 

 minence of the ridges (trochanters) which mark the points 

 of muscular attachment. The two bones that follow 

 tibia preaxial, fibula postaxial are fused together for 

 their distal half ; the fibula is very small and has no 

 olecranon process. Corresponding to the carpals we have 



