Figure 5. Batomorphii enameloid. A, B in Chondrichthyan tooth enameloid: past, present, and future

Figure 5. Batomorphii enameloid. A, B, Hypsobatis weileri, transverse section etched 5 s in 10% HCl. A, general view of the thin SCE. B, inner part of the enameloid layer, with crystallites showing a slight preferential orientation normal to the occlusal surface. C, D, Rhombodus binkhorsti, transverse section etched 5 s in 10% HCl. C, general view of the thin SCE. D, detail of the SCE. E, Leidybatis jugosus, transverse section etched 5 s in 10% HCl. SCE forming thick pillars extending far into the dentine layer, with patches of dentine fully enclosed in the enameloid (arrows). F, G, Belemnobatis sp., transverse section etched 5 s in 10% HCl. F, enameloid on the lingual face of the crown. G, detail of the enameloid layer at the level of the transverse crest. H, I, J, Parapalaeobates cf. atlanticus, transverse section etched 5 s in 10% HCl. H, enameloid microstructure showing the RBE. I, detail of the randomly oriented crystallites forming the outer SCE. J, general view of the enameloid at the level of the crown ornamentation. K, L, Ptychotrygon sp., transverse section etched 5 s in 10% HCl. K, detail of the RBE. L, detail of the SCE.