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Isoxys acutangulus (Walcott) from the Middle Cambrian Burgess Shale Formation, near Field, British Columbia, Canada. (a,b) Left lateral view (ROM 57898A). (c,d) Right lateral view (ROM 57912). (e,f) Dorsoventrally compressed specimen (ROM 57907). (g–j) Eyes and ‘great appendage’, right and left lateral view (ROM 57900 and ROM 57914A, respectively). All light photographs taken with polarized light. Midgut glands are in light grey. Scale bar 5 mm.
