STRUTHIONES 



519 



regards its adult structure, and the development has been 

 lately treated of by T. J. PARKER. 1 



Apart from the very elongated anterior part of the skull 



CO, 



ca. 



FIG. 249. STERNUM OF OSTRICH (AFTER MIVART). 

 LETTERS AS IN FIG. 74. 



the characteristics are those of the struthious birds generally. 

 The Y-shaped posterior end of the vomer bears off from 



il 



FIG. 250. PELVIS OF OSTRICH (AFTER MIVART). 

 sy, sympbysis pubis. Otber letters as in fig. 243. 



articulation with the rostrum the palatines a^id pterygoids. 

 The basipterygoid processes are large. As in all other 



1 ' Observations on the Anatomy and Development of A /it, )//.>:,' Phil. Tran 

 clxxxii. (1891), p. 25. 



