Wheeler designed several models that extended a model with fourteen faces. This is what he called the “fourth species” of the tetrakaidekahedron. It has eight regions that are small triangular pyramids facing inward and hence contribute three triangular sides each. It also has six regions that contribute eight triangular sides each. Finally, twelve regions have two pentagonal and two triangular sides. Many sides appear to be coplanar.
A mark on the model reads: Tetrakaidodecahedron (/) Fourth Species. A paper tag reads: RS 21. Another mark reads: 9 / 27.
Compare MA.304723.072 and MA.304723.073. They are not identical.
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