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ORISKANY FAUNA OF BECEAFT MOUNTAIN 71 



Khipidomella oblata iZ— idem, Helderbergian, N. Y. 



Crania pulchella E. dc (7.— idem, Helderbergian, N. Y. 



C. cf. bella Bill. — idem, Gasp^ limestone no. 5. 



Pholidops terminalis ^.— idem, ? Oriskany, Md. N. Y. 



Ph. 8j>1 



Lingula cf. rectilatera U. — idem, Helderbergian, N. Y. 



Khombipora rhonibifera H. — idem, Helderbergian, N. Y. 



Stictopora sj>. 



Unitrypa lata H. — idem, Onondaga limestone, Ontario 



U. acclivis //. — idem, Onondaga limestone, Ontario 



Lichenaiia cf. crassa II. — idem, Helderbergian, N. Y. 



Polypora separata //. (?) — idem, Onondaga limestone, Ontario 



Poljpora 



Poljpora cf. compressa H. — idem, Helderbergian, N. Y. 



Fenestella biseriata II. (?) — idem, Onondaga limestone, Ontario 



Hemitrj'pa columellata H. — idem, Onondaga limestone, Ontario 



Isotrjpa 



Reteporina 



Edriocrinus becraftensis C. — E. sacciilus II., Oriskany, Md 



Ptychonema helderbergiae H. (?). — idem, Helderbergian, N. Y. 



Vermipora streptocoelia C. 



Vermipora serpuloides H. var idem, Helderbergian, N. Y. 



Cladopora smicra C. — idem, Onondaga limestone, N. Y. 



(J. styphelia C. 



Aulopora cf. schoharie II. — idem, Helderbergian, N. Y. 



Monotrypella arbusculus H. db S. — idem, Helderbergian, N. Y. 



Hederella magna II. — idem, Hamilton shales, N. Y. 



H. arachnoides C. 



H. ramea C. 



H. gracilior C. 



"We may briefly summarize this tabulation as follows. Of tbe 94 

 clearly defined species of this fauna, 38 represent expressions of species 

 which began their existence in Helderbergian times ; on the other 

 hand, but 18 of the species of the fauna continued their existence or 

 appear to be represented by closely allied forms beyond the close of 

 the Oriskany sedimentation. 29 are represented in the earlier known 

 fauna of the arenaceous beds of the Oriskany. 



