ITS MODIFICATIONS. 175 



Class e. Terminal edges replaced by single planes. 



This modification would produce a series of four- 

 sided pyramids replacing the terminal planes, and the 

 new figures would be octahedrons with rhombic bases. 



. Obtuse lateral edges replaced by tangent 

 planes. 





Class g. Obtuse lateral edges replaced by two 

 planes. 



When the primary lateral planes are effaced by 

 the planes g, a series of secondary right rhombic 

 prisms would be produced. 



Class h. Acute lateral edges replaced by tangent 

 planes. 



