Figure 5 in Systematics, shell structure and affinities of the Palaeozoic Problematicum Cornulites

Figure 5. Shell structures in Cornulites cellulosus sp. nov. A–C, BU 4371, pseudopuncta. A, transverse view, ×45, B, longitudinal view, ×45. C, ESEM image of transverse section (scale bar = 20 µm), shell interior towards top in all images. D, BU 4371, ESEM image of transverse section across mid-region shell wall, showing bipartite structure within lamellae, scale bar = 10 µm. E, BMNH A455, transverse section across apertural region showing concentric lamellae and apertural groove filled with cellulae, ×4. F, G, BMNH A459. F, transverse section close to aperture, ×3.25. G, close-up of concentric lamellae, separated by zones of cellulae, ×4.