ON THE TRACHEA IN THE " EATITE " BIRDS. 



Fig. 5. 



237 



P.Z.S. 1881, 

 p. 783. 



Bifurcating trachea of Casuarius galeatus, from before. 

 Fig. 6. 



The same, from behind. About natural size. The portion of the stemo-tracheales 

 muscles at their insertion is represented in each figure. 



As compared with Struthio and Apteryx, all the tracheal and bronchial p. z. S. 1881, 

 rings are much less firm and more cartilaginous in Casuarius, as also P- 784. 

 in Dromceus. 



The membrana tympaniformis completing the trachea below is a simple 

 membrane, passing continuously from one bronchus to the other, with 

 no intervening pessulus. 



