No. 5.] THE PITHECOID TYPE OF EAR IN MAN. 249 



The 2iX\%x—y, or the physiognomic axis, measures 13 mm. 

 The true long axis of the ear c — d is 10 mm. in length, 

 while the greatest breadth along the axis a — b is 9.75 mm. 



The lobe of the ear is sharply marked off from the general 

 contour at its insertion into the side of the head by an inden- 

 tation which is shaded too heavily in the figure. 



Explanation of the Figure. 

 Tragus. 



the modified embryonic tubercles forming the helix. 



4- 

 5- 

 6. 

 z. 



a — b. 



r-d. 



x-y. 



Anthelix. 



Antitragus. 



Taenia lobularis. 



Posterior fold of the pinna, its apex forming Darwin's point. 



The true long axis of the ear. 



Axis of the greatest breadth. 



Vertical or physiognomic axis. 



Enclosed between 1,2, and 5, the fossa angularis. 



Extending across from 2 to o, the crus helicis. 



Extending across from 2 to 5, the crus supra-tragicus. 



The arrow x points to the Satumian point. 



Connecting 2 and o, the crus helicis. 



Connecting 2 and 5, the crus supra-tragic uni, only traces of which are as yet present. 



The two ears of the embryo are not alike in that the left 

 ear displays the reversionary character to a much greater 

 extent than the right. 



The figure represents the left ear enlarged three diameters, 



