84 Forty-second Annual Report on the 



66. *0n the Cretaceous Formations of the United States and the 



North American Continent. Pro. Am. Ass. Ad. Sci., 11th 

 meeting (Montreal), 1857, p. 158. Cambridge, 1858. 8vo. 



67. * On the Carboniferous Limestones and Coal Measures of the 



United States. (Published in the Geological Keport of Iowa, 

 1858.) Ibid., p. 158. 



68. * On the Direction of Ancient Currents of Deposition, and the 



Source of Materials in the Older Palaeozoic Rocks, with 

 Remarks on the Origin of the Appalachian Chain of Mountains. 

 Ibid., p. 158. 



69. Contributions to the Geological History oi the American Conti- 



nent. (The address of the retiring President, delivered before 

 the First Montreal Meeting of the American Association for the 

 Advancement of Science, August, 1857.) Published in the 

 Proc. Am. Ass. Ad. Sci., 2d Montreal Meeting, 1882, pp. 29-71. 

 Salem, 1883. 



70. Notes upon the Genus Graptolithus, and Description of Some 



Remarkable New Forms from the Shales of the Hudson River 

 Group, discovered in the Investigations of the Geological Sur- 

 vey of Canada, under the Direction of Sir W. E. Logan, F. R. 

 S. Canadian Naturalist and Geol., vol. 3, pp. 139-150, and 

 161-177. Montreal, 1858. 8vo. 



71. * Observations upon the Genus Graptolithus and allied Genera. 



Proc. Am. Ass. Adv. Sci., 12th meeting, Baltimore, 1858, p. 

 287. Cambridge, 1859. 8vo. 



72. * Observations upon the Genus Meganteris and other Palaeozoic 



Brachiopoda. Ibid., p. 287. 



Contributions to the Palaeontology of New York. 12th Ann. 

 Rept. Cab. Nat. Hist. Albany, 1859. 8vo. 



73. Notice of the Genera Ambonychia, Palsearca and Megambonia. 



Ibid., pp. 8-14. 



74. Observations on the Genera Capulus, Pileopsis, Acroculia, and 



Platyceras. Ibid., pp. 15-22. 



75. Observations on the Genera Platyostoma and Strophostylus. 



Ibid., pp. 20-22. 



76. Observations on the Genus Nucleospira. Ibid., pp. 23-34. 



77. Observations on the Genus Eatonia. Ibid., pp. 34-37. 



78. Observations on the Genus Rensselaeria. Ibid., pp. 38-41. 



79. Observations on the Genus Camarium. Ibid., pp. 42-44. 



80. Notes upon the Genus Graptolithus. Ibid., pp. 45-58. 



81. Trilobites of the Shales of the Hudson River Group. Ibid., pp. 



59-62. 



