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Horia's Marine Biology Page
Personal marine biology site with photomicrographs of some marine hydroid species, urchin (Paracentrotus lividus) development, and other marine invertebrates.
Midwater Hydromedusae
Photos and descriptions of midwater and deep-sea hydromedusae in Monterey Bay, California.
Obelia colony
Photo.
Obelia Laboratory Exercises
Anatomy, with illustrations.