FIG. 4 in Biostratigraphy and taxonomy of polymerid trilobites of the Manuels River Formation (Drumian, middle Cambrian), Newfoundland, Canada

FIG. 4. — Agraulos ceticephalus (Barrande, 1846): A, internal cast of a cranidium attached to the thorax with preserved exoskeleton (NFM F-3476 from 5.97 m); B, internal cast of a cranidium attached to the thorax, partly covered with sediment, eye ridges and glabellar furrows slightly visible (NFM F-3951 from 7.10 m); C, internal cast of a cranidium attached to the thorax with preserved exoskeleton, eye ridges present (NFM F-3957 from 3.30 m); D, internal cast of a cephalon attached to the thorax, librigena attached, eye ridges present (NFM F-3621 from 9.08 m); E, mould of a cranidium attached to the thorax, spines on axial rings present, coarse ornamentation on thorax visible (NFM F-3476 from 5.98 m); F, mould of a cranidium attached to the thorax, occipital spine preserved (sedimentary filling laying in glabellar mould), coarse ornamentation on thorax visible (NFM F-3946 from 4.27 m); G, internal cast of a cranidium attached to the thorax, projection of axial spine preserved (NFM F-3831 from 7.43 m); H, internal cast of a cranidium attached to the thorax, eye ridges present (NFM F-2787 from 7.56 m); I, internal cast of a cranidium attached to first thoracic segments, eye ridges and glabellar furrows preserved (NFM F-3778 from 5.96 m). Scale bars: 1 mm.