VOL. I. PLATE IV. 



FIG. 19. .A hexahedral pentagonal-do- 



decahedron. 

 a> 



FIG. 20. . The same, in inverse position. 

 a' 



rp 



FIG. 21. r ?. A right tetrahedral pentagonal- 

 . dodecahedron. 



rp 



FIG. 22. r ~ The same, in inverse position. 

 4- 

 tf 



FIG. 23. J A left tetrahedral pentagonal- 

 ^ dodecahedron. 



Tn 



FIG. 24. I . The same, in inverse position. 

 4 



If" 



