So I found an Alien.. {w/ pic}

So I went to the beach the other day to get in some of this years so-called "summer", and decided to dip my feet in the water.  It was warm, it was inviting, and it....had....an alien in it.

Presenting: The Alien

click image to enlarge

It was floating along in the water, with a large mouth-like thing with what looked like little anemone legs.  Then it looked like it had little see through eyes, and what I could only gather to be the formation of soon-to-be human legs.  It had a slug underbelly, and it was clear - you could see it's organs.  

To sum it up: Gross

I only have one question for the people of the internet:

WHAT IS THIS?

**currently excepting any answer, as I have no clue what this is**