PHALACROCORACIDZ: CORMORANTS. 725 
long filamentous feathers (considered by Nitzsch filoplumaceous), on the head and neck, and 
even, in some cases, on the upper and under parts too. These feathers are commonly white, as 
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is also a large silky flank-patch acquired by several 
species. Many Cormorants are also crested with 
ordinary long slender feathers; the crest is often 
double, and when so, the two crests may be either 
one on each side of the head, or they may follow 
each other on the middle line of the hind head 
and nape. Our species illustrate all these various 
featherings. The naked parts about the head 
vary with the species and afford good characters, 
SSS 
Fia. 504. — Sternum and shoulder-girdle of Phalacrocoraz bicristatus, nat. size. 
Fie. 505. — Skull of Phalacrocorax bicristatus, showing sto. occipital style or nuchal bone; nat. size. (From 
nature by Dr. R. W. Shufeldt. The style is somewhat tilted upward from its natural position.) 
