FIG. 11 in Silurian and Devonian brachiopods from Severnaya Zemlya (Russian Arctic)

FIG. 11. — Selected transverse serial sections, illustrating the development of internal structures in Borealis cristiformis (T. Modzalevskaya, 1985) (N 31/12991). Measurements: length 29.1 mm, width 24.0 mm, thickness 22.2 mm; loc. 14, bed 10v, Vodopad Formation. Numbers on selected transverse sections indicate the distances (in mm) from ventral beak. Scale bar: 8 mm.