CEPHALOPODA. 



ORTHOCEHAS, Breyn. 1732. 

 Orthoceras laqueatum, Hall. 1847. 



Palaeontology of New York, vol. i, p. 13, pi. 3, fig. 12. 

 Calcif erous sandrock. (Locality ?) New York. 



Geological Survey collection. 



07'thoceras primigenium, Vanuxem. 1842. 

 Geology of New York, Report Third District, p. 36. 



Palaeontology of New York, vol. i, p. 13, pi. 3, figs. 11, 11a. 

 Calciferous sandrock. Near Fort Plain, N. Y. 



Geological Survey collection. 



Orthoceras temciseptum, Hall. 1847. 



Palaeontology of New York, vol. 1, p. 35, pi. 7, fig. 6. 



Chazy limestone. Chazy, N. Y. 



Geological Survey collection, 



Orthoceras fusiforme, Hall. 1847. 

 Palaeontology of New York, vol. i, p. 60, pi. 20, fig. 1. 

 Black River limestone. Watertown, N. Y. 



Orthoceras coraliferum^ Hall. 1847. 



Palaeontology of New York, vol. i, p. 312, pi. 85, fig. 3. 



XJtica slate. Turin, N. Y. , 



Geological Survey collection. 



Palaeontology of New York, vol. i, pi. 86, fig. Ic. 



Hudson River group. Lewis county. 



Geological Survey collection. 



Orthoceras simulator, Hall. 1882. 



Eleventh Annual Report State Geologist of Indiana, p. 322, pi. 33, 

 figs. 1,3. 



Niagara group. Waldron, Indiana. 



Collected by C. D. Walcott a,nd C^ Van Deloo, 1878. 



