FIGURE 4 in Calcareous sponges (Porifera, Calcarea) from Ilha Grande Bay, Brazil, with descriptions of three new species

FIGURE 4. External and internal morphology of Paraleucilla perlucida sp. nov. A—Preserved holotype; B—Cross­section showing the cortex and a tuft of diactines (arrow); C—Tangential section of the cortex; D—Cross­section of the choanosome with the outer region (arrow 1) and inner region (arrow 2); E—Cross­section showing the subatrial skeleton (arrow 1) and the subatrial II skeleton (arrow 2); F—Cross­section of the atrial skeleton showing the apical actine of tetractines protruding into the atrium