STEUTHIONES 



519 



regards its adult structure, and the development has been 

 lately treated of by T. J. Parkbr.i 



Apart from the very elongated anterior part of the skull 



CO, 



CO. 



Fig. 249. — Steenum of Ostkioh (after Mivaet). 

 Letteks as in Pig. 74. 



the characteristics are those of the struthious birds generally. 

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



Fig. 250. — Pelvis of Ostrich (after Mivart). 

 »y, symphysis pubis. Other letters as in flg. 243. 



articulation with the rostrum the palatines and pterygoids. 

 The basipterygoid processes are large. As in all other 



' ' Observations on the Anatomy and Development of Apteryx,' PhAl. Tram 

 clxxxii. (1891), p. 25. 



