. Bulletin of the British Museum (Natural History), Geology. 144 SILURIAN BRACHIOPODS studies, but the only major contributor has been Havlicek (1952, 1961, 1967) with detailed studies on the Bohemian fauna. However much knowledge has been gained on Ordovician forms, particularly by Cooper (1956) and Williams (1962 etc.), and an acceptable classification has been formulated (WiUiams 1965). III. MORPHOLOGICAL TERMINOLOGY In most descriptions of the superfamily, the morphological terminology used has been based on the assumed function of the structures, although the Plectambonitacea are among th
. Bulletin of the British Museum (Natural History), Geology. 144 SILURIAN BRACHIOPODS studies, but the only major contributor has been Havlicek (1952, 1961, 1967) with detailed studies on the Bohemian fauna. However much knowledge has been gained on Ordovician forms, particularly by Cooper (1956) and Williams (1962 etc.), and an acceptable classification has been formulated (WiUiams 1965). III. MORPHOLOGICAL TERMINOLOGY In most descriptions of the superfamily, the morphological terminology used has been based on the assumed function of the structures, although the Plectambonitacea are among those brachiopods in which direct homology with living forms is most conjectural. Thus a descriptive terminology is defined and used in this paper with- out functional connotation ; the attempt is made subsequently to assess the use of the structures in the live animal. There is a shortage of terms which do not connote some degree of function, and it has been necessary to create two new terms, bema and clavicular plates. median septum inner side septum outer side septum bema. cardinal process clavicular plate. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). London : BM(NH)
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