balancing out the charismatic megafauna

Here's an unidentified invertebrate... we were speculating that it's a polyp form of a medusa (jellyfish) but aren't sure... anyone know? Another idea is a sea pen, but they don't have tentacles. It's really big for a medusa polyp, but we are in Antarctica.






Here's Dennis admiring a giant pile of nemerteans (predatory worms).















And more nudibranchs (on a giant tunicate)