Fig. 6.4 Shell of Cuvierina columella, a euthecosomatous pteropod. (a) Whole shell.
(b) SEM of cracked shell surface, scale bar = 10 μm. (c) Enlargement of aragonite
(CaCO 3 ) crystals, scale bar = 1 μm.
(^) (After Bé et al. 1972.)