Please identify this growth on my rock

[sheila0910]

Soft and squishy. Doesn’t feel like a mushroom or leather coral. notice in the pictures it has a couple of vent holes. Some form of sponge maybe ?

 

[JumboShrimp]

Yes, my 2-cents is some type of a harmless sponge.

 

[themcnertney]

some type of sponge I'd say