Zygospira modesta (Say in Hall 1847)
27mm. On a plate found by the Credit river in Caledon, On., Canada. Lower Silurian, Llandoveryian, Whirlpool Formation.
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By Ludwigia
27mm. On a plate found by the Credit river in Caledon, On., Canada. Lower Silurian, Llandoveryian, Whirlpool Formation.
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