Piece of bell only.
Here are two Phacellophora camtschatica or Fried Egg Jellies (on this site Egg-yolk Jellies) floating by the pier of the Port Townsend Marine Science Center. I often see them drifting into this little harbor in late summer, and today there were three, ranging in diameter from 6" to 14".
This was the first dead Lion's Mane Jelly I've seen this season. Last September there were hundreds washed ashore. This one washed ashore and visible during a minus tide. It measured about 12" across.
Numerous specimens seen on passage from Woods Hole to Menemsha. Note numerous fish fry following specimen. Likely butterfish.