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A trip this morning to my hill out back amidst the usual Bois Blanc Fm spoils. I acquired a few more Anchiopsis anchiops pygidia and a few interesting oddities. One of those was this pictured pygidium. Going through my Ludvigsen text, it looks remarkably similar to Mystrocephala stummi (see the black and white picture for reference, drawn from Ludvigsen). These are reported in the Amherstburg Formation, and not the Bois Blanc (but they are pretty contiguous as one overlies the other). I was hoping to get confirmation if this is the correct taxonomic name, or if it has since been updated. The only other reference I've located so far is older than Ludvigsen's 1979 text: Fagerstrom, J.A.. 1961. The fauna of the Middle Devonian Formosa Reef Limestone of southwestern Ontario. Journal of Paleontology 35(1):1-48. Of course, I could be dead wrong with my tentative ID - but the specimen looks remarkably similar to the one pictured in the Ludvigsen volume. Image from Ludvigsen, Rolf. 1979. Fossils of Ontario. Part 1: The Trilobites. Toronto: Royal Ontario Museum.