FIG. 17 in Biostratigraphy and taxonomy of polymerid trilobites of the Manuels River Formation (Drumian, middle Cambrian), Newfoundland, Canada

FIG. 17. — Acontheus inarmatus Hutchinson, 1962: A, internal cast of a cranidium, faint glabellar furrows preserved, slightly punctuated ornamentation (NFM F-3143 from 16.67 m); B, internal cast of a cranidium, occipital node preserved (NFM F-3211 from 15.63 m); C, internal cast of a cranidium, occipital node preserved (NFM F-3701 from 15.68 m); D, internal cast of a cranidium, slightly punctuated ornamentation (NFM F-3150 from 16.67 m); E, internal cast of a cranidium (NFM F-3167 from 16.67 m); F, internal cast of a cranidium, glabellar furrows on left side of glabella slightly visible (NFM F-3659 from 16.67 m). Scale bars: 1 mm.