. Bulletin of the British Museum (Natural History), Geology. . Fig. 5. Mantle canal patterns in the pedicle valve of Eoplectodonta duplicata. The figures are drawn as internal moulds and the adductor muscle scars coloured black, (a) from BB 31990 (Plate 8, figs. 3, 4), Woodland Point, Girvan, (b) from GSM 37579, Plate 8, fig. 7), Gasworks Sandstone, Union Hill, Pembrokeshire, (c) to (f) all from Gasworks Mudstone, the Gasworks, Haverfordwest, Pembrokeshire (c) BB 31753 (Plate 6, fig. 8), (d) and (e) both BB 31732 (Plate 6, fig. 3), (f) BB 31740 (Plate 6, fig. 7). would have been to some degree
. Bulletin of the British Museum (Natural History), Geology. . Fig. 5. Mantle canal patterns in the pedicle valve of Eoplectodonta duplicata. The figures are drawn as internal moulds and the adductor muscle scars coloured black, (a) from BB 31990 (Plate 8, figs. 3, 4), Woodland Point, Girvan, (b) from GSM 37579, Plate 8, fig. 7), Gasworks Sandstone, Union Hill, Pembrokeshire, (c) to (f) all from Gasworks Mudstone, the Gasworks, Haverfordwest, Pembrokeshire (c) BB 31753 (Plate 6, fig. 8), (d) and (e) both BB 31732 (Plate 6, fig. 3), (f) BB 31740 (Plate 6, fig. 7). would have been to some degree duplicatory. Since the brachial valve would have been in motion much more than the pedicle valve, it would obviously have preferred to lighten its load as much as possible. For these reasons, the setae, and the corre- sponding mantle canals, could have become enlarged in the pedicle valve as com- pared with the brachial valve. However there is no suggestion that the setae and vascular system became atrophied in the brachial valve ; there are rare specimens of Eoplectodonta (for example the individual figured in Plate 5, figs. 3 and 6) in which the mantle canal. 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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