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Ctenodonta levata (Hall) 

 Page 100 

 Fig. I Right valve, x 2. 



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



Ctenodonta declivis nov. 

 Page loi 

 Fig. 2, 3 Lateral and posterior view of holotype. x 2. 



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



Ctenodonta prosseri nov. 

 Page loi 

 Fig. 4, 5 Lateral and posterior views, x 4. 



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



Ctenodonta radiata nov. 

 Page 102 

 Fig. 6 Lateral view of holotype. Natural size. 



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



Ctenodonta recta nov. 

 Page 102 

 Fig. 7, 8 Lateral and posterior views of holotype. x 3. 



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



Ctenodonta subcuneata nov. 

 Page 103 

 Fig. 9, 10 Lateral and posterior views of holotype. x 1.5. 



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



Allodesma ct. subellipticum Ulrich 

 Page 103 

 Fig. II Specimen, x 2. 



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



Lyrodesma schucherti nov. 

 Page 103 

 Fig. 12 Holotype. x 2. 



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



Solenomya ? insperata nov. 

 Page 105 

 Fig. 13, 14 Two specimens (cotypes) showing the common expression of 

 the form, x 1.5. 

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



Cuneamya acutifrons Ulrich 

 Page 106 

 Fig. 15 Anterior portion of specimen. Natural size. 

 Fig. 16 Surface sculpture, x 8. 



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



Saffordia ulrichi nov. 

 Page 107 

 Fig. 17, 18 Lateral and anterior views of holotype. Natural size. 

 Schenectady beds. Schenectady, N. Y. 

 All originals are in the New York State Museumx. 



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