PLATE X. 
Fig. I. Tetradium minus^ Safford. natural size. B, cross-section enlarged; 
copied. Mouth of Bull creek, Indiana. Richmond group. 
Fig. 2. Protarea richmondensis-papiUata. A, natural size. a part of the 
same specimen, enlarged. Encrusting Strophomena planumhona. Dayton, Ohio. 
Whitewater bed. 
Fig. 3. Streptelasma insohtum. Walls of calyx broken off. A mile and a half 
southeast of Westport, Indiana. Whitewater bed. 
Fig. 4. Streptelasma divartcans, Nicholson. A, the calyx of one specimen. 
B, the same, enlarged. C, D, lateral views showing calyces. E, a group viewed 
from above. Osgood, Indiana. Whitewater bed. 
Fig. 5. Brachiospongia tuherculata, James. A, view of lower surface. B, 
lateral view. Both views reduced in size. The greatest dimension is 235 mm. 
Seven miles west of Wilmington, Ohio, south of the road from Ogden to Van- 
devorts Corner, along one of the branches entering Todds Fork from the west. 
Liberty bed. 
