Author: Clarkson, E.N.K., 1966.:
Title: Schizochroal eyes and vision of some Silurian astacid trilobites./ / Schizochroal eyes and vision in some phacopid trilobites.
Description: Palaeontology, 9(1): pp. 1-29. 3 plates, 10 figs., refs.; 9(3): pp. 464-487, 3 plates, 9 figs., refs. Two offprints orig. wrappers.

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