440 PROCEEDINGS OP THE NEW YORK MEETING 



27. On Graptolites, tlieir duration in geological periods, and their valne in the 



identification of strata: Ihid., pp. 3-51-352. 

 2S. Description of new species of fossils, and observations upon some other species 



previously not well known from the Trenton limestone: Third Ann. Kept. 



N.Y. Stale Cab. Nat. Hist., Albany, 1850, pp. 167-175, 5 pis. 



29. * Remarks on the geology of Mackinac, Drummond, and Saint Josephs islands 



and the northern shores of lake Michigan: Proc. Am. Assoc. Adv. Sci., 4th 

 meeting (New Haven, 1850), Washington, 1851, p. 354. 



30. * Report on the invertebrate fossils exhibited to the Association: Froc. Am. 



Assoc. Adv. Sci, 5th meeting (Cincinnati, 1851), Washington, 1851, p. 180. 



31. * Parallelism of the Palaeozoic rocks of New York with those of the western 



states and of all those with the Palaeozoic strata of Europe: Ibid., p. 59. 



32. * On the Silurian rocks of the Lake Superior land district : Ibid., pp. 64-66. 



33. * Catalogue of specimens of the rocks and fossils in the gray sandstone, Medina 



sandstone, Clinton group, Niagara group, Onondaga salt group, and a part 

 of the Waterline group: Fourth Ann. Repl. N. Y. State Cab. Nat. Hist., 

 Albany, 1851, pp. 119-146. 



34. On Drummonds island: Proc. Am. Acad. Arts and Sci., vol. ii, Boston, 1852, pp. 



253, 254. 



35. * Compai'ison of the geological features of Tennessee with those of the State of 



New York : Proc. Am. Assoc. Adv. yS'ci., 6th meeting (Albany, 1851), Wash- 

 ington, 1852, pp. 256-259. 



36. * Remarks upon the fossil corals of the genus Favosites and allied fossil genera 



Favistella, Astrocerium, and others : Ibid., p. 306. 



37. *0u the Palaeozoic genera Trematopora, Callopora, etc. : Ibid., p. 306. 



38. * Tracks, trails, etc., in the shales and sandstones of the Clinton group from 



Green bay, with remarks on the thinning out and reappearing of this por- 

 tion of the Clinton group: Ibid., 306. 



39. * Remarks on the trilobite of the Potsdam sandstone, named by Dr Owen 



Dikellocephalus, and its relations to Asaphus and Ogygia : Ibid., p. 301. 



40. * Remarks upon the fossils of the Potsdam sandstone: Ibid., p. 304. 



41. Notice of a geological map of the United States and the British provinces of 



North America, with explanatory text, geological sections and ])lates of the 

 fossils which characterize the formations, by J. Marcou : Am. Jour. Sci., 2d 

 ser., vol. 17, New Haven, 1854, pp. 199-206. 



42. Rapport sur laPartie Geologique de I'Exposition de New York. C. Lyell and 



J. Hall. Traduit par M. A. Laiigel : Annates des Mines, vol. vi, Paris, 1854, 

 pp. 1-85. 



43. Report on coal lands in Kentucky for the Kentucky Mining and Manufactur- 



ing Company : B. Silliman and J. Hall, New York, 1855, 16 pp. 



44. * Observations upon the geology of the Mauvaises Terres, Nebraska, with notices 



of the geographical and geological range of some of the fossils of that region : 

 Proc. Am. Assoc. Adv. .Sci., 8th meeting (Washington, 1854), Cambridge, 1855, 

 p. 290. 



45. * Remarks upon a collection of Cretaceous fossils from Nebraska, and the ab- 



sence of species known in southern extension of same formation : Ibid., p. 290. 



46. * Remarks upon the results of extensive and continued collections of fossil 



species from a portion of the Silurian rocks of New York, showing the num- 

 ber of species and individuals of each species obtained from a limited local- 

 ity during a period of ten years : Ibid., p. 290. 



