312 



PKOF. d'aECY W. THOMPSON ON THE 



[Apr. 2, 



it runs iu three somewhat widely separate feather-rows downwards 

 outside the line of the byoid cornua. It is separated from its 

 fellow of the other side, firstly, by an elongated oval apterion 

 (text-fig. 78, fr.apt.) extending as far back as the middle of the 



Text-fig. 77. 



Lor.Tfk. 



FR.TR.^ 



_>P cermRpt. 



Ptevylosis of Patagona gigas, side view, reduced, 

 /r.^r., frontal tract; lor.tr., loral do.; rain.tr., ramal do.; lcd.tr., lateral do.; 

 lat.cerv.tr., lateral cervical do. ; p.cerv.a/pt., posterior cervical apterion ; 

 scap.apt., scapular do. ; lat.thor.a'pt., lateral thoracic do. ; ^yp-, typo- 

 pteron; ax.", 'second row' of axillaries. 



orbit and directly continuous with the posterior extension of the 

 horny beak, and secondly by a small triangular space on the top of 

 the head (text-fig. 78, occip.apt.), corresponding to the vertex of 

 the triangle between the long hyoid cornua. Between these two 



