534 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



Zone No. 7. — Pyramid zone. 

 (100) : (012) : (100). Symbol j. ^ = 2. 



VOL. 59. 



Form... 

 Symbol. 



s 



i nil 



i 



312 



3/2 



324 



3/4 



A 



112 



1/2 



012 

 



1.6.12 



1/12 



148 

 1/8 



_ h 

 3. 10. 20 

 3/20 



124 



1/4 



T12 

 1/2 



100 



Dividing at and reversing the first part gives: 



Symbol 1/2 3/4 3/2 co 



N 3 ' t /« 1/2 2 / 3 3/2 2 3 oo 



The first or positive portion of the zone is thus normal, with four 

 forms missing but none extra. The second portion gives: 



Symbol 1/12 1/8 3/20 1/4 1/2 oo 



4v 1/3 1/2 3/5 1 2 oo 



Dividing at 1 : 



Symbol 1/3 1/2 3/5 1 



1/2 1 3/2 oo 



0,1, 1/2 2 / 3 1 3/2 2 3 oo 



The zone is then normal with no extra forms. This is especially 

 gratifying, since new forms with high indices, such as T-6-12 and 

 3.10.20, fit in very well. 



Zone No. 8. — Pyramid zone. 



(100) : (023) : (100). Symbol ~ 4= ? 



V 



1-v 



N,.. 



I l 3 



Form... 

 Symbol. 



\ lot 



u 



123 

 1/3 



h 



[023] 

 



123 



1/3 



_b 



223 

 2/3 



346 



5/6 



Dividing at and considering the last part: 



Symbol 1/3 3/3 5/6 oo 



j= 1/2 1 5/4 oo 



iV 2 1/2 1 2 oo 



This zone is thus normal, with 5/4 or 546 extra. This form, 

 described by Ungemach and confirmed by the present investigation, 

 may be considered to be well established. 



Zone No. 9. — Pyramid zone, 

 h k 4 



(100): (043): (100). Symbol 



V I 



Form . . . 

 Symbol . 



343 

 1 



