III RELATIONSHIP TO REPTILES 3 
eo 
easily distinguishable. These are absent both in 
birds and reptiles (fig. 11). 
Se 
o/ 
Vic. 10.—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 
Fic. 11.—Part of vertical column of Rabbit. 
r, Epiphyses, applied to anterior and postericr end of centrum of each vertebra. 
developed in the Duck-billed Platypus, the lowest of 
mammals, with a decidedly reptilian anatomy. 
D 
