Pa Aa 
Fig. 1. Prioniodus recedens, Bryant. Tooth in matrix. X-20. 
Fig. 2, 6-14. Prioniodus recedens, Bryant. XX 25. 
Figs. 3-5. Prioniodus abbreviatus, Hinde. X 25. 
All of the originals figured on this plate are from the Conodont 
bed (basal Genesee), in Eighteen Mile Creek, Erie County, N. Y. 
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