FIGURE 4. Hymeniacidon torquata Topsent, 1916 in Sponges from Doumer Island, Antarctic Peninsula, with description of new species of Clathria (Axosuberites) Topsent, 1893 and Hymeniacidon Bowerbank, 1858, and a re-description of H. torquata Topsent, 1916

FIGURE 4. Hymeniacidon torquata Topsent, 1916, skeleton: A, transverse section in MNRJ 20667 showing loose choanosomal ascending tracts obscured by the overlaid halichondroid architecture, ending in surface bouquets; B, transverse section in MNRJ 20689 showing ectosomal bouquets; C, same as B, but in MNRJ 20693; D, transverse section in MNRJ 20689 showing loose choanosomal ascending tracts obscured by the overlaid halichondroid architecture; E, same as " D ", but in MNRJ 20693. Scale bars: A–E = 300 µm.