Sowerbyella sericea (Sowerby 1839) & Paucicrura rogata (Sardeson 1892)

Along with the larger R.alternata in the middle which appears in the next picture. S.sericella in the middle at the top and at the bottom right, each measuring 1cm. P. rogata, 2 of them on the upper right and 1 at the bottom left up to 13mm. From JD quarry, Gamebridge, On. Canada. Verulam Formation, Katian, upper Ordovician.