PLATE XXIX, 



I'ago. 

 ( i ASTRIOCEKAS EXCELSUM ilcek 88 



Specimen So. 6226, palfontologio rnllectinn. Walker Museum, rniveri^ity of Chicago. 



Upper Coal Measures, Osage, Kaus. 

 View from above, natural size. 



Note. — Photograph loam^il by Dr. .'^fnart Weller, I'nivei'sity of (.-hicago. 



20(i 



