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2p furrows angles anterior anteriorly appear authors axial furrows axis Bainella Bokkeveld broad Burmeisteria caffer cephalon Clarke close club comprises connected considered convex currently Dalmanites deep described Description developed differs directed Discussion distally distinct dorsal external eyes field figured foramen Formation frontal lobe genal genera genus glabella grooves head herscheli Histriophoca holotype impressed included individuals internal moulds known Kozlowski Lake lateral length lobes longer Male margin material median Metacryphaeus Middle moderately monachines Monachus narrow Note occipital original outline pairs Pennaia Phacopina Phacops phocids pits pleural posterior border present preserved probably prominent psoas major pygidium Reed referred regarded region relatively Rennie represent ribs ring rows sagittal Salter Schwarz seals seems segmentation separated short shows similar slightly species specimens spines strongly suckers suggested suture terminations thorax transverse trilobites tubercles weakly width Wolfart writer Zone