Figure 1 in Systematics, phylogeny, and natural history of Bullacta exarata (Philippi, 1849): an endemic cephalaspidean gastropod from the China Sea

Figure 1. Shell of Bullacta exarata. (A–B) Neotype (MNHN 4494, Paris; shell height (H) = 17 mm); (C) scanning electron microscope detail of dorsal part of shell showing spiral grooves (MNHN, Paris; H = 17 mm); (D) internal whorl showing the absence of columella; white arrowheads pointing to the folded cord of periostracum that results from the dissolution of the columella (MNHN, Paris; H = 17 mm). Note: Scale bar, (C) 200 µm.