Fig. 9

Excurrent canals and osculum A. Excurrent canal showing apopyles of several chambers emptying into the canals. One endopinacocyte has a pair of short cilia (arrow, enlarged in B). C-E. Osculum tip showing cells inside the osculum have a pair of cilia that project out perpendicular to the direction of flow out of the osculum. A,B,D: SEM; C: Light microscopy of a live sponge; E: Phase contrast microscopy of a live sponge