place. These undoubtedly have relation to the movements of the Cincinnati axis. Large Corals. In the Block Coal or Middle bed one often sees heads of corals sticking above the general surface of the river shelf. Formerly the Upper Coral zone was quarried for lime the cause of the wide present exposure of the Block Coal zone. Of Favosites many can be seen 4 to 5 feet in diameter and one was measured having a diameter of 8 feet. A colony of many hemispheric masses one from into the other had a spread of 14 by 8 feet. Of Cyathophyllum sylvestre one was seen 8 feet in diameter. Of the smaller Renacea Cladopora Leon showed me the remnant of a colony once having a diameter