Orthoceras arcuolineatum no v. 



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Fig. I Holotype. Natural size. 

 Fig. 2 Section of same. 



Canajoharie shales. Fort Edward, Saratoga county, N. Y. 



Orthoceras hudsonicum nov. 



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Fig. 3 Fragment showing the septa and surface sculpture. Natural size. 



Fig. 4, 5 Two specimens showing the protoconch. x 5. 



Fig. 6 Section of same, showing the first funnel at a. x 5. 



Fig. 7 Straight specimen, from the Schenectady beds at the Dettbarn 



quarry near Schenectady and possibly different. Natural size. 

 Fig. 8, 9 Specimens that are slightly curved in the apical (neanic) region. 



Natural size. 

 Fig. ID Section of neanic conch showing the closely arranged septa. 

 Natural size. 

 The holotype (fig. 8) and the originals (paratypes) of figures 

 4, 5, 6, 9, 10 are from the Canajoharie beds at Alplaus; the 

 original of figure 3 is from Watervliet, and that of figure 7 

 from the Dettbarn quarry at Schenectady. 



Orthoceras cf. amplicameratum (Hall) 



Fig". II Fragment, much compressed. Natural size. ,• 



Canajoharie shale. Near Glens Falls, N. Y. 



Oncoceras (?) sp. 



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Fig. 12 A completely flattened specimen. 



Snake Hill beds. Signal Works near Albany, N. Y. S 



All originals are in the New York State Museum. 



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