186 



MEMOIRS OF THE CARNEGIE MUSEUM 



slightly better developed than in any existing cormorant, and while the difference 

 is small, still it does exist, and here again it is seen by comparison to be the develop- 

 ment of a character found in young birds. 



34 



36 



Crauia of various Cormorants. ( After Lucas. ; 



FIG. 34. Phalacocorax penidllatus. 



Fid. 35. Phalacrocorax perspicillatus. 



Flo. 36. Phalacrocorax carlo. (Two thirds natural size ; from photographs. ) 



" Difference exist between P. perspidllatus and other cormorants by the presence 

 of a narrow bar of bone forming two precranial cavities where but a single opening 



