. Bulletin of the British Museum (Natural History) Geology Supplement. cardinal process socket — tooth brachiophore dental plate muscle scar. Fig. 7. Diagrammatic views of (A) the ventral and (B) the dorsal interiors of Salacorthis. Ventral interior with subparallel dental plates extending forward for one-seventh the pedicle valve length, suboval ventral muscle scar undifferentiated, extending anteriorly for nearly one-third the length of the pedicle valve. Dorsal interior with brachiophore bases extending forward for over one-quarter the length of the brachial valve ; median septum supporting
. Bulletin of the British Museum (Natural History) Geology Supplement. cardinal process socket — tooth brachiophore dental plate muscle scar. Fig. 7. Diagrammatic views of (A) the ventral and (B) the dorsal interiors of Salacorthis. Ventral interior with subparallel dental plates extending forward for one-seventh the pedicle valve length, suboval ventral muscle scar undifferentiated, extending anteriorly for nearly one-third the length of the pedicle valve. Dorsal interior with brachiophore bases extending forward for over one-quarter the length of the brachial valve ; median septum supporting the cardinalia short, extending anteriorly for two-fifths the length of the brachial valve. Type material. Holotype length width (mm) Paratypes 37 ii-o 5-o 12-0 4-5 External and internal moulds of brachial valve (BB 37153a, b) Internal mould of pedicle valve (BB 37154) Incomplete external mould of brachial valve (BB 37155) Incomplete external mould of brachial valve (BB 37156) Incomplete external mould of brachial valve (BB 37157) Horizon and localities. Spy Wood Grit: BB 37153, 37154 from exposures on top of ridge 1440 yds NNE of Rorrington bench mark 599 (Grid Ref. SJ 303018) ; BB 37155, 37157 from outcrops 1100 yds NNE of Rorrington (Grid Ref. SJ 303015) ; BB 37156 from outcrops in the north bank of Spy Wood Brook 170 yds north-east of Spy Wood Cottage (Grid Ref. SO 282958). Discussion. No other species congeneric with Salacorthis costellata has yet been so described although in view of the strongly developed platystrophiinid characters of the Spy Wood form and the microscopic nature of its chief differentiating feature, some stocks, currently recorded as Platystrophia or Mcewanella, may ultimately prove to belong to 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 Hi
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