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19. 1890. WoRTHEN, Amos H. : Geological Survey of Illinois, Vol. VIII, p. 72, 



pi. ix, figs. I, la ; pi. x, figs. 13, 13a. 



20. 1900. Simpson, George B. : Preliminary Descriptions of New Genera of 



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21. 1901. Lambe, Lawrence M. : Contributions to Canadian Palaeontology, Vol. 



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22. 1908. Carruthers, R. G. : "A Revision of Some Carboniferous Corals." 



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 pis. 4, 5, 6. 



23. 1909. Grabau, Amadeus W., and Shimer, Hervey W. : North American 



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24. 1910. Salee, Achille : Contribution a L'Etude des Polpiers du Calcaire 



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and Biological Survey. Geological Series No. 1. The Monroe For- 

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Paleontological Laboratory, Columbia University. 



