Archinacella orbiculata (Hall) 

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Fig. i, 2 Very little distorted specimens, x 2. From squeeze. 



Snake Hill beds. Snake hill, Saratoga county, N. Y. 

 Fig. 3, 4, 5 6 Dorsal and lateral views of Hall's types, x 2. 

 Snake Hill shale. Near Waterford, N. Y. 



Cyclonema montrealense Billings 

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Fig. 7 Specimen, x 1.5. From squeeze. 



Snake Hill beds. Snake hill, Saratoga county, N. Y. 



Cyclonema cushingi nov. 

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Fig. 8 Surface of holotype. Natural size. From squeeze. 

 Fig. 9 Cast of interior of same. 

 Fig. 10 Surface sculpture, x 5. 



Snake Hill beds. Snake hill, Saratoga county, N. Y. 



Pterotheca cf. canaliculata (Hall) 



Fig. n Specimen, somewhat crushed. Natural size. 



Snake Hill beds. Snake hill, Saratoga county, N. Y. 



Hyolithes pinniformis nov. 

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Fig. 12 Holotype, showing a septum near the apex, x 5. 

 Fig. 13 Paratype. x 5. 



Canajoharie shale. Canajoharie, Montgomery county, N. Y. 

 All originals are in the New York State Museum. 



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