Paramecium, enlarged approx. 1600 times, showing the cell inventory of a protozoa: macro and micronucleus, contractile vacuoles, cytostome with membranellae, myonemes and food vacuoles and the formation of the endo and ectoplasm and the network of neuronemes, it also shows the structure of the pellicle of the ectoplasm, and the position and order of the trichocysts and a range of cilia in typical order, mounted on base with key card.