294 



AUGUST F. FOERSTE 



the pebbles are only 4 inches in length, and only a few exceed 

 12 inches in length, 7 inches in width, and 1 inch in thickness, 

 but occasionally specimens much larger than this are seen. One 



Fig. 5. — Pebble, of natural size, supporting two colonies of Protarea rich- 

 mondensis. From layer D in the Elk Run section, east of Winchester, Ohio. 



