EXPLANATION OF THE ILLUSTRATION 
Figure I. Sphondylophyton hyenioides Schultes $ 
Dorf gen. et sp. non. Heliotype reproduction of a 
photograph of the type specimen. Three fifths 
natural size. Paleobotanical Collections, Princeton 
University, No. 24101; Beartooth Butte formation, 
Beartooth Butte, Wyoming, U. S. A. Lower De- 
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