Fig. 9 in Minute Silurian oncocerid nautiloids with unusual colour patterns

Fig. 9. Shell malformations in Pomerantsoceras pollux (Barrande, 1866). A. Specimen CGU SM 318 with a false rib at the base of body chamber, in lateral (A1) and ventral (A2) views. B. Specimen CGU SM 316, body chamber with conchal furrow−like malformation, in ventral view. C. Specimen NM−L 571, anomalous septal growth, in lateral view (C1), and detail of youngest phragmocone chamber with a pair of pits, in lateral view (C2). All figured specimens come from Butovice Na Břekvici Section, Colonograptus colonus Zone, Gorstian, Ludlow. Each specimen is coated with ammonium chloride.