<p>A–C and D–E, <i>Ichthyosaurus</i> SMNS Unnumbered outer and inner parts of the section respectively. A, primary fibrolamellar bone (FLB) in natural light (NL); note the isotropic nature of the primary fibrous bone (FB); B, FLB in polarized light (PL) illustrating the variable orientations of the primary osteons; C, ‘unusual parallel-fibered bone’ (UPFB) in PL with gypsum filter; D–E, extremely compact core of the section made of almost exclusively secondary bone in PL and PL with gypsum filter. F–I, <i>Ichthyosaurus</i> IPB R222 outer cortex. J, <i>Ichthyosaurus</i> SMNS Unnumbered outer cortex. F–H, primary FLB in PL with gypsum filter; F, laminar organization; G, radiating FLB; H, important amount of primary FB in the osseous trabeculae. I–J, UPFB in I, PL with gypsum filter and J, NL respectively; note the occurrence of simple vascular canals. FB: fibrous bone; PFB: parallel-fibered bone.</p
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