In Peripatus capensis the organ in question can hardly be described as tetrahedral.
The general form is the tetrahedral pentagonal dodecahedron (fig. 41).
It crystallizes in the cubic system; with regular octahedral and tetrahedral cleavages; spec.
The tetrahedral form invented by Dr. Graham Bell is unique and interesting.
Thorax nearly three-sided pyramidal or tetrahedral, with three rounded edges and sub-regular, circular pores.
The young spores (G, H) are nearly colorless and are tetrahedral (like a three-sided pyramid) in form.
The tetrahedral or Reye complex is the simplest and best known of proper quadratic complexes.
Polar spines very thick and short, tetrahedral, one-fourth as long and broad as the major axis.
To the south, 27 E., is a tetrahedral peak, which our guide called Ngoma-dingding.