. Bulletin of the British Museum (Natural History), Geology. ANTARCTIC BRACHIOPODS 133 mm 14-. Fig. 17 Scatter diagram showing relationship of length to width in specimens of Bouehardia antarctica S. S. Buckman; same material as in Fig. 18. # - IPS loc. T-30. A - IPS Iocs 4, 22, 45. O - W. N. Croft Iocs. All the specimens examined by him were collected from localities within the same geological horizons specified at that time. There is little to be said in favour of such narrow taxonomic splitting as Buckman effected, and it is more likely that, within the entire assemblage occurring in the Te
. Bulletin of the British Museum (Natural History), Geology. ANTARCTIC BRACHIOPODS 133 mm 14-. Fig. 17 Scatter diagram showing relationship of length to width in specimens of Bouehardia antarctica S. S. Buckman; same material as in Fig. 18. # - IPS loc. T-30. A - IPS Iocs 4, 22, 45. O - W. N. Croft Iocs. All the specimens examined by him were collected from localities within the same geological horizons specified at that time. There is little to be said in favour of such narrow taxonomic splitting as Buckman effected, and it is more likely that, within the entire assemblage occurring in the Tertiary rocks on Seymour Island, no more than two actual species exist. Variants assigned to the species Bouehardia ovalis, B. elliptica, B. attenuata and B. angusta can be recognized in random samples from the same horizon and localities as those of the dominant species B. antarc- tica. The variation in form seems to be affected principally by the breadth of the valves or the extent of the hinge-line, those individuals with narrower or less extensive hinge-lines appearing somewhat more oval in outline. Samples containing a mixture of specimens previously identified as B. antarctica, B. ovalis, B. elliptica, B. attenuata and B. angusta, together with samples of both large and small unidenti- fied specimens collected from Seymour Island by members of the IPS expedition of 1974-75, have been measured. Taking straightforward parameters of length, width and thickness of the valves, the measurements have been plotted and are figured here as scatter diagrams, Figs 17 and 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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