Zubi seacucumber and swimming anemone / Seewalze und Schwimm-Anemone http://www.starfish.ch/invertebrates-Wirbellose/echinoderms-Stachelhauter/seacucumber.html
Photo of a seacucumber with a swimming anemone on it (with links) – Seewalze mit Schwimm-Anemone drauf ((Thelenota ananas and Boloceroides mcmurrichi)