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 203a. 1856. Advanced Textbook of Geology, 1st edit., pp. 128, 135,-136, figs. 

 203b. 1859. Ibid., 2d edit., pp. 163, 171, 181, 189. 



204. 1859. Handbook of Geological Terms, 1st edit., pp. 161, 305-6, 340. 

 Parkinson, James C. 



205. 1811. Organic Remains of a Former World. Vol. Ill, p. 267, pi. XVII, 



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208. 1880. On Some New Species of Fossil Scorpions from the Carboniferous 



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209. 1881. Further Researches among the Crustacea and Arachnida of the 



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210. 1885. Ancient Air Breathers. Nature, Vol. XXXI, pp. 295-298, figs. 1, 2. 



211. 1899. New Discoveries in the Silurian of Lanarkshire and Ayrshire. Sum- 



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 Peach, B. N., Clough, M. A., Hinxman, L. W., etc. 



212. 1910. The Geology of the Neighborhood of Edinburgh. Memoirs of the 



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 Peach, Benjamin and Horne, John. 



213. 1880. The Old Red Sandstone of Orkney. Read before Royal Physical 



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214. 1898. New Discoveries in the Silurian and Old Red Sandstone of Scotland. 



Summary of Progress of the Geological Survey of the United King- 

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215. 1899. The Silurian Rocks of Britain. Mem. Geol. Surv. United Kingdom, 



Vol. 1, Scotland. 

 Phillips, John. 



216. 1885. Manual of Geology. Edited by Robert Etheridge. 

 Pictet, F. J. 



217. 1854. Traite de Paleontologie, Paris. 2nd edit, tome II, pp. 529, 536-539. 



