C.  Systematics
		• 1.  Phylum Cnidaria • a.  Class Hydrozoa • Marine and freshwater • Polyps only (Hydra) or Alternate polyp/medusa (Obelia) • No mesentaries or septa in G.V.C • Medusae have manubrium and velum • In some colonial forms polyps may be modified as floats (Physalia)