PAE vel 
Fig. 1. Prioniodus erraticus, Hinde. X 20. 
Figs. 2, 6. Prioniodus colligatus, Bryant. 20. 
Figs. 3, 11. Prioniodus dilatus, Bryant. X 25, 
Fig. 4. Prioniodus dilatus, Bryant, showing excavation of the 
underside. 20. 
Fig. 5. Gnathodus americanus, Bryant. X 20. 
Figs. 7-10, 12. Polygnathus solidus, Hinde. X 20. 
Originals are from the Conodont bed (Genesee) in Eighteen Mile 
Creek, Erie County, N. Y. 
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