1888.] 



the Skeleton of the Apteryv. 



395 



Fig. 4. 



prolongation, ofxit/r turbinal. 



Mesial surface of turbinate. 



Fig. 5. . 



Horizontal section along a, b. 



The turbinals consist of in-growths of the ali-ethmoid into the nasal 

 cavity, and are altogether three in number. They may be called 

 respectively anterior, middle, and posterior turbinals. The posterior 

 turbinal has the form of a vertical scroll of very thin cartilage, 

 attached by the upper and lower ends of one edge to the ali-ethmoid, 

 but free in the middle ; it is rolled upon itself caudad, forming about 

 one turn and a half. 



The middle turbinal is attached along the whole length of one 

 vertical edge : from its attachment it passes mesiad, then tarns 

 sharply laterad, then curves mesiad again, and passes forwards 

 (upheld) as a broad plate somewhat indented in the middle by a 

 vertical furrow, which gives it, when viewed from the inner face, the 

 appearance of a double fold : this broad plate is attached to the ali- 

 ethmoid all along its vertical edge, and in front is rolled upon itself 

 caudad, forming a scroll of one turn which is attached above and 

 below but free in the middle. 



2 f 3 



