556 NEW YORK STATE MUSEUM 



I 



Orthoceras lentum sp. nov. 



Page 433 



I, 3 External view and section of the type 



2 Part of the section (x 2) to show more distinctly the character 



of the siphuncular elements 

 The original is from the dove-colored Chazy limestone of Little 



Monty bay and now in the New York State Museum , 



S. 



Spyroceras clintoni Miller (sp.) 



Page 445 

 See pi. 16, fig. 4-7 



4 Redrawing of Hall's type of Orthoceras subarcuatum 



(= Spyroceras clintoni) figured in Palaeontology of 

 N'ezu York, volume i, plate 7, figure 3. Shows the composition 

 of the type specimen of fragments of two different species. 

 The original is in the American Museum of Natural History in 

 New York. 



Orygoceras cornu-oryx Whitfield (sp.) . 



Page 450 



5 Fragment showing the regular internal constrictions of the wall 



of the conch, its rate of growth and the depth of the cameras 



6 A specimen with slightly different character of the constrictions 

 7, 8 Specimen showing the smooth nonannulated outside of the wall. 

 The originals of figures 5, 7, 8 are from the Fort Cassin beds at 



Fort Cassin and now in the museum of Burlington University; 

 that of figure 6 is from the same formation (A3) at Valcour N. Y. 

 and now in the New York State Museum. 



