Paramecium, enlarged approx. 1600 times. The model shows the cell inventory of a protozoa - macro and micronucleus, contractile vacuoles, cytostome with membranellae, myonemes and food vaculoules and the formation of the endo and ectoplasm and the network of neuronemes.

A detailed block 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. Seperates into 2 parts, on base.