O.K., I think that I got it. It is the body of a pelagic snail, probably Carinaria cristata (see https://www.mindenpictures.com/search/preview/glassy-nautilus-carinaria-cristata-san-diego-california/0_00445268.html). That blueish-conical thing is the shell. The clear body is part of the foot and visceral mass. The narrow arrow-shaped object embedded in the jelly-like mass in the second picture is the digestive tract. Damn!!!