Ill 



RELATIONSHIP TO REPTILES 



33 



easily distinguishable. These are absent both in 

 birds and reptiles (fig. n). 



n- — — 3d 



i 



v 



Fig. io. — Side view of head of Rhea. 



q, quadrate ; qj, quadrato-jugal, hindmost component of bone connecting with 



upper jaw ; sq, squamosal. 



(4) The coracoid bone is present. . In man there is 

 only a small remnant of its upper end. It is well 



Fig. 11. — Part of vertical column of Rabbit. 

 E, Epiphyses, applied to anterior and posterior end of centrum of each vertebra. 



developed in the Duck-billed Platypus, the lowest of 

 mammals, with a decidedly reptilian anatomy. 



D 



