468 



GEOLOGY OF THE BLACK HILLS. 



CEETACEOUS— Continued. 



Systematic name. 



Gasteropoda — Continued. 



Anchura (Drepanocheilus) nebracensis E. 

 & S. 



Lunatia concinna H. & M 



Vanikora anibigua M. & H 



Aniauropsis paludinajformis H. & M 



Margarita nebrascensis M. & H 



Auisomyon alveolus M. & H 



subovatus M. & H 



patelliformis M. & H 



borealis Morton 



Akera glansoryza, n. sp 



Haminea subcylindrica M. & H 



Dentaliuin gracile H. & M 



CEPHALOPODA. 



Nautilus dakayi var. montanensis Meek 



Prionocyclus wyomingensis Meek 



Scaphites nodosus Owen , 



var. brevis Meek , 



quadrangularis Meek 



plenus M. & H 



warreni M. & H , 



wyomingensis M. & H 



Helicoceras stevensoni, n. sp 



Heteroceras ne wtoni, n. sp 



? nebracensis M.&H 



Ancyloceras jenney i, n. sp 



tricostatum, n. sp 



Ptychoceras rneekanum, n. sp 



crassum, n. sp 



Division. 



No. 



4 or 5 



or 5 



Locality. 



East fork of Beaver Creek 



Cheyenne River, near Rapid Creek.. . 



Cheyenne River 



Cheyenne River, near Box Elder Creek. 

 One hundred and fifty miles above 

 mouth of Yellowstone. 



Old Woman Fork 



do 



do 



Cheyenne River 



Cheyenne River, near French Creek.. 



Old Woman's Fork 



Cheyenne River, near Rapid Creek . . 



.do. 



East fork of Beaver Creek 



Cheyenne River, near Rapid Creek . . 



do 



do 



East fork of Beaver Creek 



do 



West of Beaver Creek 



do 



East fork of Beaver Creek 



do 



Cheyenne River, nenr French Creek. 



Beaver Creek 



Old Woman Fork 



429 



430 



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433 

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