A spongocoel l is the large, central cavity of sponges. Water enters the spongocoel through hundreds of tiny pores (Ostia) and exits through the larger opening (osculum). Depending on the body plan of the sponge (which can be asconoid, syconoid, or leuconoid), the spongocoel could be a simple interior space of the sponge or a complexly branched in... Found on http://en.wikipedia.org/wiki/Spongocoel
(from the article `sponge`) ...by choanocytes that surround fingerlike projections called radial canals of the sponge wall. Water enters the radial canals directly through ... Found on http://www.britannica.com/eb/a-z/s/143