)ull. s oc, Geol.de France. 



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3^Serie,t.XVII.PL.XV. 



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L.Sohier ad. nat.del. etlitli, 



Lmp. Edouard Bry, Pans. 



l,2,3._Horiopleura Baylei, Co quand, sp, 

 4,5,6._Polycoiiites Verneuili, Baylei. 



