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Landlocked or coastal, these eleven carefully prepared and selected slides bring the diversity of marine life to your classroom. Slides cover gross and fine structures of representatives from several significant and widely distributed groups. Radiolaria, strew. Ulva, w.m. Sea-lettuce, green alga. Diatoms-Marine, w.m. Polysiphonia, w.m. Red alga. Metridium, c.s. or l.s. Sea anemone. Obelia, w.m. Colonial hydroid. Neanthes (Nereis), w.m. Parapodium. Crab zoea, w.m. Larval form. Sea star ray, c.s. Amphioxus, w.m. Fish scale, placoid, w.m. Dogfish (Squalus).