PLATE IX. 
Fig. I. Dystactospongia madisonensis. Madison, Indiana. Saluda bed, 7 
feet above the chief Columnaria layer. 
Fig. 2. Heterospongia, probably H. knotti. A mile and a half southeast of 
Lebanon, Kentucky. In the upper part of the Maysville formation below the 
Arnheim horizon. 
Fig. 3. Streptelasma, apparently an aberrant form of Streptelasma vagans. 
Dayton, Ohio. Whitewater bed. 
Fig. 4. Streptelasma dispandum. Moores Hill, Indiana. In the Upper or 
Blanchester division of the Waynesville bed. 
Fig. 5. Dystactospongia madisonensis. A little over two miles south of Ver- 
sailles, Indiana. Part of the surface of a lobate form, similar to that represented 
by figure i. At the base of the Saluda bed, immediately beneath the Tetradium 
horizon. 
Fig. 6. Streptelasma divaricans-angustatum. Osgood, Indiana. Whitewater 
bed. 
Fig. 7. Beatricea undulata-cylindrica. Four miles north of Richmond, Ken- 
tucky. Liberty bed. 
