. The structure and life of birds . 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 isonly a small remnant of its upper end. It is well. Fig. 11.—Part of vertical column of , Epiphyses, applied to anterior and posterior end of centrum of each vertebra. developed in the Duck-billed Platypus, the lowest ofmammals, with a decidedly reptilian anatomy. D 34 THE STRUCTURE AND LIFE OF BIRDS chap.

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