Deebya Broadheadt, Hall. / 



Page 346. 



Figs. 15, 16. Profile and cardinal views of an entire individual, showing the 

 rugose and somewhat irregular pedicle-valve and the median sinus of the 

 brachial valve. 

 Upper Coal Measures. Kansas City, Missouri. 



Derbya (?) BiLOBA, Hall. 



Page 350. 



Figs. 17, 18, Cardinal and dorsal views, showing the bilobed contour and obo- 

 vate outline, x 2. 

 Coal Measures. Winterset, Iowa. 



383 



