Onnellia sp. (Bancroft 1928) ?
2 of them in the middle and on the right, the largest measuring 13mm. across. From the banks of the Credit river in Caledon, On., Canada. Lower Silurian, Llandoveryian, Whirlpool Formation.
By Ludwigia
2 of them in the middle and on the right, the largest measuring 13mm. across. From the banks of the Credit river in Caledon, On., Canada. Lower Silurian, Llandoveryian, Whirlpool Formation.
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