FIG. 15 in Biostratigraphy and taxonomy of polymerid trilobites of the Manuels River Formation (Drumian, middle Cambrian), Newfoundland, Canada

FIG. 15. — Plutonides hicksii (Salter, 1866b): A, internal cast of a cranidium, occipital node preserved, with a vertical groove crossing the cranidium (NFM F-2781 from 4.52 m); B, internal cast of a cranidium with preserved exoskleleton (NFM F-3894 from 2.96 m); C, internal cast of a cranidium, occipital node and ornamentation on fixigenae preserved (NFM F-2861 from 2.53); D, internal cast of a cranidium, with a vertical groove crossing the cranidium (NFM F-3258 from 4.06 m). Scale bar: 3 mm.