Leptaena rugosa (Dalman 1828) & Strophomena sp. (Blainville 1825)
By Ludwigia
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Strophomena at the right 3cm. Leptaena up to 2cm. From the banks of the Credit river in Caledon, On., Canada. Lower Silurian, Llandoveryian, Whirlpool Formation.
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