328 PROCEEDINGS OF THE AMERICAN ACADEMY. 



includes this form in his_list without comment. It marks the inter- 

 section of the zones [5051 : 0551], [3121 : 2461] and [1341 : 6281] all 

 of which contain well established forms. The form may be considered 

 as fairly probable. 



Zone 9 = Z 9 . — Scalenohedrons of the Zone [0111 : 1120] = 

 [221 : 10T]. -=- (Miller) = \. Symbol |- 



Like the preceding, this zone is susceptible of development without 

 splitting. The following forms have been recorded: 



Form 



«■_ Q L A 2 Q_ (8| 



221 322 16- 10- 11 13-8-9 745 423 



3 8 13 7 



2 5 84 



13 5 3 



2 5 8 4 



13 (5\ 3 

 2 5 



2 



1 



1 



For 



m 



( f_ e_ n_ n ^_ a _ 



J947 524 625 13-4-11 827 101 



Symbol | | 3 ^ 4 



»-l | § 2 I 3 



N 4 (!) • I 2 (i) - 3 



00 



Referred to N4 this zone is incomplete and contains the extra forms 

 13 9 , 13 



8 > 4 ana 4 • 



2 (5-17-22-12) = (13-8-9). This scalenohedron was observed by 

 Hofer " on crystals from Rauris near Salzburg. The form falls in 

 normal series N5 and presents some fairly good zonal relations. It is 

 somewhat probable. 



F (5-11-16-6) = (947). This scalenohedron was noted by Pal- 

 ache 10 ° on one crystal from the Lake Superior region of Michigan. 

 Palache's figure shows this form developed to a series of planes of fair 

 size and_suggests that the form may lie in zone with (2-9-TI-5) and 

 (10-1-11-0), both of which are present on the combination. This 

 zonal relation does not, however, hold. The form which falls in 



99 Hofer, H., Min. Mitth., 12, 487 (1891). 



100 Palache, C, Geol. Surv. Mich., 6, Plate 13, Fig. 11 (1900). 



