1 54 ^^h^ American Geologist. March, i899 
2d meeting (Cambridge), 1849, pp. 256 — 260. Boston, 1850. 8vo. 
26. On the Brachiopoda of the Silurian Period; particularly the 
Leptienidse. Ibid., pp. 347 — 350. 
27. On Graptolites, their Duration in Geological Periods, and 
iheir Value in the Identification of Strata. Ibid., pp. 351 — 352. 
28. Description of New Species of Fossils, and Observations upon 
some other Species previously not well known, from the Trenton 
Limestone. Third Ann. Report State Cab. Nat. Hist., pp. 167 — 175. 
5 plates. Albany, 1850. 8vo. 
29. *Remarks on the Geology of Mackinac, Drummond and St. 
Joseph's Islands and the Northern Shores of Lake Michigan. Proc. 
Am. Assoc. Ad. Sci.. 4th meeting (New Haven), 1850, p. 354. Wash- 
ington, 1851. 8vo. 
30. * Report on the Invertebrate Fossils exhibited to the Associa- 
tion. Proc. Am. Assoc. Ad. Sci., 5th meeting (Cincinnati), 1851, 
p. 180. Washington, 1851. 8vo. 
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. 
ZZ. ^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. 4th An. 
Rep. N. Y. St. Cab. Nat. Hist., pp. 119 — 146. Albany, 1851. 8vo. 
34. On Drummond's Island. Proc. Am. Acad. Arts and Sciences, 
vol. II, pp. 253, 254 Boston, 1852. 
35. ^Comparison of the Geological Features of Tennessee with 
those of the State of New York. Proc. Am. Assoc. Ad. Sci., 6th 
meeting (Albany), 1851, pp. 256 — 259. Washington, 1852. 
36. *Reniarks upon the Fossil Corals of the Genus Favosites. and 
allied Fossil Genera Favistella, Astrocerium and others. Ibid., p. 
,?o6. 
2,"]. *On the Pakeozoic Genera Trematopora, Cellepora. etc. Ibid., 
p. 306. 
' 38. *Tracks, Trails, etc., in the Shales and Sandstones of the Clin- 
ton Group from Green Bay, with remarks on the thinning out and 
reappearing of this portion of the Clinton Group. Ibid., p. 306. 
39. ^Remarks on the Trilobite of the Potsdam Sandstone, named 
by Dr. Owen. Dikellocephalus, and its Relations to Asaphus and 
Ogygia. Ibid., p. 30T. 
40. *Remarks upon the Fossils of the Potsdam Sandstone. Ibid.. 
!>• 304- 
41. Notice of a Geological Map of the United States and the 
British Provinces of North America, with Explanatory Text, Geologi- 
cal Sections and Plates of the Fossils which characterize the forma- 
tions, by J. Marcou. .\m. Jour. Sci.. 2d Ser.. vol. 17. pp. 199 — 206. 
New Haven, 1S54. Svo. 
