entitled, Fossil Flora and Fauna of
the Pennsylvanian Period, Will County, Illinois by George Langford (1876-1964) Return
mazonensis, and Gyromices ammonis, page 88. Note:
of the original page 88 is here.
The original page was letter size
but the image may have been cropped slightly.
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Gyromices ammonis, a
snail-like parasite on a fern.