Crystals of Epsom Salt (Magnesium Sulfate Heptahydrate) under the microscope using polarized light. Crystals of Epsom Salt (Magnesium Sulfate Heptahydrate) under the microscope using polarized light. Mold of the genus Pilobolus growing on horse manure Dinoflagellate of the genus Peridinium swimming on the surface of a submerged leaf of moss. Freshwater annelids of the genus Chaetogaster. Specimen of marine polyp (Anemonia sp.) in its early stages of growth. Strobila of the jellyfish Aurelia aurita from the Mediterranean sea. Final stage of development. Strobila and ephyra of the jellyfish Aurelia aurita from the Mediterranean sea.