FIGURES 12–20 in A new species of Calliostoma (Vetigastropoda: Calliostomatidae) from Canopus Bank, off northeastern Brazil

FIGURES 12–20. Anatomy of Calliostoma melliferum; 12. head-foot, right view, anterior portion of mantle also shown; 13. same, left view; 14. head and haemocoel, ventral view, foot and columellar muscle removed; 15. foregut and nerve ring, right view; 16. pallial cavity and visceral mass, ventral view, layer of digestive gland ventral to stomach removed; 17. foregut, ventral view, longitudinally opened, odontophore deflected to right; 18. nerve ring, ventral view; 19. odontophore, dorsal view, first layer of membranes and muscles removed, both cartilages slightly deflected; 20. same, ventral view, anterior region of m4 and br removed, right-anterior portion of m11 showing its topology (scales = 1 mm).