PEALE Vi 
Figs. 1-5, 8. Prioniodus radiatus, Hinde. X 25. 
Fig. 6. Prioniodus colligatus, Bryant. X 30. 
Fig. 7. Prioniodus muricatus, Bryant. X 25, 
Fig. 10. Prioniodus colligatus, Bryant. 25. 
Figs. 9, 11. Prioniodus retusus, Bryant. X 30. 
Originals are from the Conodont bed (Genesee) in Eighteen Mile 
Creek, Erie County, N. Y. 
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