. Bulletin of the British Museum (Natural History), Geology. . Fig. 124 a-c, Didymograptus (Expansograptus?) uniformis lepidus Ni 1979. Upper Arenig, Fennian, B. rushtoni Biozone, Pontyfenni Formation, loc. 23; a, stipes partly chloritized, x 2, Q5182; b, proximal end, x 10, from Q5092; c, showing sicula'tooth', x 10, Q5099. d, Didymograptus (Expansograptus?) simulans Elles & Wood 1901, proximal end for comparison with lepidus, showing how distal part of sicula aligns itself with one stipe; type slab, Skiddaw Slates, Barf, Cumbria, probably D. nitidus Biozone, x 10, SM Please note
. Bulletin of the British Museum (Natural History), Geology. . Fig. 124 a-c, Didymograptus (Expansograptus?) uniformis lepidus Ni 1979. Upper Arenig, Fennian, B. rushtoni Biozone, Pontyfenni Formation, loc. 23; a, stipes partly chloritized, x 2, Q5182; b, proximal end, x 10, from Q5092; c, showing sicula'tooth', x 10, Q5099. d, Didymograptus (Expansograptus?) simulans Elles & Wood 1901, proximal end for comparison with lepidus, showing how distal part of sicula aligns itself with one stipe; type slab, Skiddaw Slates, Barf, Cumbria, probably D. nitidus Biozone, x 10, SM 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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