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IV.—Synopsis of the Genera and Species of Carboniferous Limestone Trilobites

Published online by Cambridge University Press:  01 May 2009

Henry Woodward
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Extract

Having published in the Palæontographical Society’s Volume for the current year the first part of my Monograph on the Trilobites of the Carboniferous Limestone, it occurred to me that a brief account of the species described might prove useful to some of the readers of the Geological Magazine.

Type
Original Articles
Information
Geological Magazine , Volume 10 , Issue 10 , October 1883 , pp. 445 - 454
Copyright
Copyright © Cambridge University Press 1883

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References

1 Messrs. Meek and Worthen, in their description of two Carboniferous Trilobites from Illinois and Indiana, remark, “eyes apparently smooth, but showing, when the outer crust is removed, numerous very minute lenses beneath,”Geol. Surv. Illinois, vol. v., “Palaeontology,” 1873, 4to. pp. 528, 529.Google Scholar This observation may serve to explain the fact that many specimens do not show the faceted surface at all clearly; this is especially the case in the genus Griffithides. Emmrich believed it possible to use this character of the external surface of the eyes of Trilobites, as a means of classification, but I have not been able to accept his proposed arrangement based on this structure. (See Emmrich, De Trilobitis; Berlin, 8vo. 1839.)