Found two colonies in shallow water. Roughly apricot-sized. The colonies are cylindrical but almost look like plicate, or built from sausage-shaped elements around a superior dimple. Also, it looks like the tentacles are in a veil, like the Ctenophoran order Lobata.

This is the first time I see this genus, and my ID may be wrong.

This is also posted on jellywatch.org, at: http://jellywatch.org/node/6278

Rather low-quality videos at: https://youtu.be/Y00avIFSt1c and https://youtu.be/U5ePnPquD08