Letter | Published:

Shell-structure of Thecidean Brachiopods

Naturevolume 175page1124 (1955) | Download Citation



IN thecidean brachiopods, which range from the Rhaetic to the present day, the shell-structure is less definite, and shows more variation, than in many other brachiopod sub-orders. Investigations I have carried out of this point1, as part of work undertaken for a “Treatise on Invertebrate Paleontology”, resulted in the conclusion that the structure was initially obscurely pseudopunctate, becoming densely punctate when a certain degree of structural organization was attained. This punctation never shows the regular en quinquonce pattern of the terebratuloids: it was attained in different stocks at different dates.

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  1. 1

    Elliott, G. F., Ann. Mag. Nat. Hist., Ser. 12, 6, 693 (1953).

  2. 2

    Eudes-Deslongchamps, E., Mém. Soc. Linn. Normandie, 9, 230 (1853).

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  1. Geological Research Centre, Iraq Petroleum Co., Ltd., 214 Oxford Street, London, W.1

    • G. F. ELLIOTT


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