Manuscript entitled, Fossil Flora and Fauna of the Pennsylvanian Period, Will County, Illinois
by George Langford (1876-1964)
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Orthotarbus robustus, Metatarbus triangularis, Discotarbus, Ootarbus and Architarbus rotundatus, page 108.
Note: the complete page 108 is here.  
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Orthotarbus robustus, 600 dots per inch.	Metatarbus triangularis Orthotarbus robustus.
Orthotarbus robustus. Discotarbus Ootarbus	Architarbus rotundatus Ootarbus