52 



ON THE AXIAL SKELETON OF THE STEUTHIONID^. 



Struthionidte in having long sacculated caeca coli and no aftershaft to the contour- 

 feathers ; while Apteryx differs from Casuarius and DromoBus in having the caeca coli 

 well developed, an extra femoro-caudal muscle, and an ambiens of extra size. 



Fig. 44. 



Casuarius. 



The affinities of the Struthious genera, as manifested by their axial skeleton, may, 

 perhaps, then, be represented as shown in the accompanying diagram (fig. 44). 



