Any ideas what these are?

[Arain]

Hi all,

I just noticed these 3 white round things on one of my rocks. Curious to know what they are. Any ideas?

 

[fishface NJ]

Pineapple sponges

 

[ISpeakForTheSeas]

Looks like a sponge - possibly a pineapple sponge, though I can’t tell from the photo (would need a side view). Harmless filter feeders.

 

[mww00ds]

Could be pineapple sponges

 

[WheatToast]

Sponges, though I’m not sure if they’re pineapple sponges which have prominent “fibers” surrounding their oscula. Usually harmless-filter feeders.

 

[Arain]

I tried to get a better picture by moving the rock closer. One of them I just noticed on the right side does appear to have the little crown thingy. I initially only saw the 3 in the pic but moving it closer I found a 4th one. Sorry the pics suck. I tried . Thank you all for such quick answers

 

[Mikedawg]

Yeah, sponges