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1 1809. Martin, W.— Petrificata Derbiensis, 4to, t. 45, fig. 4. 



2 1811. Parkinson, J. C. — Organic Remains of a Former World, 4to, vol. iii, p.* 267, pi. xvii, fig. 18. 



3 1820. Konig, Icones Fossilium Sectiles : Centuria Seconda, pi. xviii, fig. 230. 



* 1825. Dekay, Dr. J. E.— Ann. of the Lyceum of Nat. Hist, of New York, p. 375, pi. xix. 



5 1831. Scouler, Dr. J.— Cheek's Edinburgh Journ. of Nat. and Geograph. Science, vol. iii, 



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6 1835. Harlan, Dr. Richard. — Medical arid Physical Researches, Philadelphia, p. 297 ; see also 



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8 1835. Bronn, H. G. — Lethsea Geognostica, p. 109, t. 9, figs. 1 and 2 (figures of E. remipes and 



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 n 1838. Kctorga, Dr. S. — Beitrag zur Kenntn. der Organ. Ueber. des Kupfersand. am Westl. 



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22 1844. Agassiz, L. — Mon. des Poissons Foss. du Vieux Gres Rouge, ou Syst. Devonien. Neuf- 



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23 1845. Brodie, Rev. P. B. — Hist, of Fossil Insects in the Secondary Rocks of England. Introduc- 



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