. Bulletin of the British Museum (Natural History). Zoology . SHELL STRUCTURE OF THE BIVALVIA 95 suggested that the factors responsible for its establishment so far from the shell margin are associated with the active habits of the family, and specialisation of the mantle edge. Increased distance of mantle attachment from the margin of the shell would enable the development of long, more efficient muscle fibres, and thus rapid withdrawal of the mantle edge. We have examined the fine structure of the inner calcified ligament of Chlamys senatoria, the details of which will be publis
. Bulletin of the British Museum (Natural History). Zoology . SHELL STRUCTURE OF THE BIVALVIA 95 suggested that the factors responsible for its establishment so far from the shell margin are associated with the active habits of the family, and specialisation of the mantle edge. Increased distance of mantle attachment from the margin of the shell would enable the development of long, more efficient muscle fibres, and thus rapid withdrawal of the mantle edge. We have examined the fine structure of the inner calcified ligament of Chlamys senatoria, the details of which will be published at a later date. Wada (1964a) has briefly mentioned the foliated structure of Chlamys nipponensis. SPONDYLIDAE (Plate 4, fig. 1 ; PI. 14, figs. 2, 6 ; text-figs. 26, 59-60.) Four species have been examined, both optically and mineralogically. The shell contains both calcite and aragonite. There is, in all the species that we have examined, an outer, foliated calcite layer. The folia are arranged in a similar fashion to the Pectinidae. A middle aragonitic, inner crossed lomellar layer. middle crossed lamellar layer aragonite Fig. 59. Pectinacea : Spondylidae. Spondylus gaederopus. General view of the interior of the 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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