WHITLOCK. — CRYSTAL FORMS OF CALCITE. 313 



of (15 -7 -22 -8) does not fall at any important zone intersection, the 

 form occurs in normal series X3 in the above development and may be 

 considered fairly probable. 



In the zone fragment between K: and P: the following scaleno- 

 hedrons have been observed: 



( . These two scalenohedrons were 



Referred to N 3 this zone fragment is somewhat incomplete and 

 contains the extra forms fj, j|, jf, j§, £§, and j^, three of which are 

 obviously close to the pole of the common form (2131) = (20l). 



a: (41-21-62-20) = (41-0-21) 



r: (25-13-38-12) = (25-0-13): 

 reported by Sansoni 64 from Schapbachthal, Baden. They were 

 found on one crystal and are evidently vicinal to K: (2131). Both 

 forms, although included in the lists of Rogers 65 , Bumuller 66 and 

 Whitlock 67 , should be classed as doubtful. 



L: (17-9-26-8) = (17-0-9). This scalenohedron was first noted 

 by Zippe 68 on crystals from Hoffnungsbergbrau, near Lissnia, on 



64 Sansoni, F., Giorn. d. Min., 1 (2), 299 (1900). 



65 Rogers, A. F., S. of M. Quar., 22, 429 (1901). 



66 Bumuller, C. N., Jahrb. f. Min. B. B., 28, 233. 



67 Whitlock, H. P., N. Y. State Mus. Mem., 13, 42 (1910). 



68 Zippe, F. X. M., loc. cit. 



