. Bulletin of the British Museum (Natural History), Geology. cardinal process clavicular plate. FiG. 2. Brachial valve of Eoplectodonta duvalii. The term " anderidium " (Sadlick 1965) was defined primarily for the chonetids (according to its original definition it replaces the term " lateral septa " as used by Muir-Wood, 1962, fig. 3A). Sadlick refers to the " anderidia " of sowerbyellids, but he does not elaborate on this use, or provide or refer to illustrations. Thus it is not clear which structures he had in mind for sowerbyellids, and whether these would be h
. Bulletin of the British Museum (Natural History), Geology. cardinal process clavicular plate. FiG. 2. Brachial valve of Eoplectodonta duvalii. The term " anderidium " (Sadlick 1965) was defined primarily for the chonetids (according to its original definition it replaces the term " lateral septa " as used by Muir-Wood, 1962, fig. 3A). Sadlick refers to the " anderidia " of sowerbyellids, but he does not elaborate on this use, or provide or refer to illustrations. Thus it is not clear which structures he had in mind for sowerbyellids, and whether these would be homologous with the anderidia in chonetids, and so the term is not used in this paper. Gill (1969), whilst describing the Notanopliidae, an interesting Devonian group which might have been descended from some sowerbyellid, erected a new series of names for various sets of septa in both valves. He rightly draws distinctions be-. 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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