FIGURE 16. Ascoleucetta compressa. A, C–F, BMNH 1924.9.1.3 in Taxonomic revision of Leucascus Dendy, 1892 (Porifera: Calcarea) with revalidation of Ascoleucetta Dendy & Frederick, 1924 and description of three new species

FIGURE 16. Ascoleucetta compressa. A, C–F, BMNH 1924.9.1.3, holotype; B, WAM Z31421. A, Preserved specimen; B, Transverse section showing the cortex (ct), choanocyte tubes and atrium (at); C, Tangential section showing the cortical skeleton with large triactines around the inhalant apertures; D, Trichoxeas (arrow) protruding into the lumen of an inhalant aperture; E, Apical actine projected into the lumen of a tube; F, Atrial membrane.