Furnished with these facts, it is not difficult to recognize true beroidal forms in the embryos of sea-urchins and star-fishes, published by Muller in his beautiful plates, and thus to trace the medusoid origin of the echinoderms, as the polypoid origin of the medusae has already been recognized.
"Louis Agassiz: His Life and Correspondence"
Louis Agassiz
The medusoid generation is suppressed in this genus.
"Freshwater Sponges, Hydroids & Polyzoa"
Nelson Annandale