Question

where osculum is found

Answer 1

I osculum is found in spongocoel

Answer 2

In spongocoel, osculum is found.

Osculum is an excretory structure in the living sponge, a large opening to the outside through which the current of water exits after passing through the spongocoel where wastes diffuse into the water and the water is pumped through the osculum carrying away with it the sponge's wastes. This is the function of the osculum which is present in spongocoel.