614 



PROF. J. COSSAK EWART OiN THK 



Text -figures 3 & 4. 



mes 



Sh 

 met"' 



Diagrams indicating the relation of the mesoptile to the protoptile and to the first 

 true feather of a Ringed Penguin : — pro., the protoptile, consisting of four 

 outer barbs representing a shaft and of four inner barbs representing an after- 

 shaft, sh.mes., shaft of mesoptile continuous distallj^ with protoptile and 

 proximally with the shaft of the true feather.- af.mes., mesoptile aftershaft also 

 continuous with the protoptile and the true feather, ch., connection with pro- 

 .toptile. c, connection with shaft of true featlier. ca., connection with after- 

 shaft of ti'ue feather, cal., calamus. 



