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Nortonechinus welleri Thomas, 1924; BMNH E16678-79. Lime Creek Shale, Cerro Gordo Member, Devonian, Portland, Cerro Gordo County, Iowa, USA. Internal (left) and external (right) views of two interambulacral plates. Plate length 8 mm.
Nortonechinus welleri Thomas, 1924; BMNH E16678-79. Lime Creek Shale, Cerro Gordo Member, Devonian, Portland, Cerro Gordo County, Iowa, USA. Internal (left) and external (right) views of two interambulacral plates.
Plate length 8 mm.
