Proceediugs U. S. National MuatMini, Vol. X, 18S7. — Stejnejier. 



PLATE VII. 



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10/672 



1. — Bill of Stercorarius parasiticus, normal ooiulition {p. 124). 

 2. — Billot' S'ercorarius parasiticus, shedding (p. 124). 

 3-6. — Heads of ^gialitis mutif/ola (p. 127). 



