632 R. W. SHUFELDT 
of great rarity—have been found in the Florissant formation at 
Florissant, Colo. Fossil bird feathers, however, have been found 
in various parts of Europe and elsewhere in the world. 
After I had the conversation with Professor Frank H. Knowlton 
in regard to the mistaking of fossil ferns for birds’ feathers, Mr. 
Fic. 4.—Specimen shown in Fig. 3, enlarged three and one-half diameters (linear) 
Gilmore kindly turned over to me the specimens shown in Figs. 5 
and 6 of this article, they being the best of several others the 
National Museum had like them, and practically all they had. 
This is a single slab, fortunately cleft, that shows the impress 
(V) and fossil remains (A) of four primary feathers of a bird’s 
