High-resolution Plate 1

Plate 1: All SEM images. Scale bar represents 1 mm. 1–3 Polycope arcys Joy and Clark 1977. 1, USNM 594082, PS2179, 9–10 cm; RV, lateral view. 2, USNM 594083, PS2186-5, 10–11 cm; LV, lateral view. 3, USNM 594084, PS2202-2, 0–1 cm; LV, lateral view. 4–9 Polycope bispinosa Joy and Clark 1977. 4, USNM 594085, PS2186-5, 10–11 cm; RV, lateral view. 5, USNM 594086, PS2186-5, 10–11 cm; RV, lateral view. 6, USNM 594087, PS2179, 9–10 cm; RV, lateral view. 7, USNM 594088, PS2164-4, 0–1 cm; LV, lateral view. 8, USNM 594089, Geomar 23243-1, 90–91 cm; LV, lateral view. 9, USNM 594090, Geomar 23243-1, 180–181 cm; LV, lateral view.