WHITLOCK. — CRYSTAL FORMS OF CALCITE. 309 



f: (1-6- 7 -13) = (760). This sealenohedron was noted by Schal- 

 ler 47 on crystals from California. It lies in the zone [0001 : 1670] 

 which contains the forms (1674) and 1671), but of which the limit- 

 ing prism has not as yet been recorded. The form falls in normal 

 series X5 and may be considered fairly probable. 



i :(4-7-lT-18) = (11-7-0). This sealenohedron was recorded 

 by Moesz 48 _on crystals from Korosmezo, Hungary. Although the 

 pole of (4-7-11- 18) does not mark the intersection of any well defined 

 zone, the form falls in normal series N 4 and should be regarded as 

 fairly probable. 



Hypothetical Scalenohcdrons: The hypothetical form (1347) = 

 (430) reduces to \ in the above development. The hypothetical 

 sealenohedron (1347) lies in the well defined vertical zone [0001 : 

 1340] of which the limiting prism is a very well established form. 

 Several other more or less well marked zones intersect at this pole. 

 The form should be retained as hypothetical. 



In the zone fragment between "(1123) = (210) and (2134) = (310) 

 the following forms have been observed: 



Referred to X 3 this portion of the zone is incomplete and contains 



the extra form l $. 



m : (11-6-17-23) = (17-6-0). This sealenohedron was noted by 

 Gonnard 49 on crystals from Couzon, France. The form does not 

 fall at any zone intersection and must be regarded as doubtful. 



The zone fragment between (2134) = (310) and (lOll) = (100) 

 contains the following forms: — 



47 Schaller, W. T., Zeit, f. Kryst., 44, 324 (1908). 



48 Moesz, G., Fold. Kozlony., 27, 495 (1897). 



49 Gonnard, F., Bull. Soc. fr. Min., 20 (1897). 



