Was Rhizostomites admirandus Haeckel of Solnhofen a true jellyfish? (abs.)
"The traditional assignment of the famous Rhizostomites admirandus Haeckel of the Jurassic (Solnhofen) deposits of Bavaria requires re-examination. The criteria of its hitherto unquestioned reference to the Rhizostomeae, highest order of the true jellyfish (Scyphozoa), are most highly questionable. . . . It is at least morphologically plausible that Rhizostomites admirandus Haeckel is a Hydromedusa having the aspect of certain modern Trachylina."