312 PROCEEDINGS OF THE AMERICAN ACADEMY. 



Referred to N 4 this fragment of the zone is nearly complete and con- 

 tains the extra forms yj and jj. 



B: (17-2-19-15) = (17-0-2). This scalenohedron according to 

 Irby has been observed a number of times. 61 Although not a promi- 

 nent zone intersection, the form seems to be fairly probable. 



X: (17-5-22-8) = (15-0-7). This scalenohedron was noted by 

 Rogers 62 as occurring on calcite crystals from Great Notch, N. J. 

 Although somewhat striated parallel to the zone the form is said to 

 have given good reflections. It should be classed as fairly probable. 



In the zone fragment between H: and K: the following forms have 

 been recorded: 



Referred to No this fragment of the zone is complete and contains 

 the extra form ^. 



SF: (15-7-22-8) = (15-0-7). This scalenohedron was observed 

 by Schnorr 63 on crystals from Neumark, Prussia. Although the pole 



61 von Zepharovich, V. R., on calcite from Bleiburg, Lotos (1878). 

 Hessenberg, F., on calcite from Bleiburg, Min. Not., 8. 

 Schnorr, on calcite from Zwickau (1874). 



vom Rath, G., on calcite from Ahrenthal, Pogg. Ann., 155. 



62 Rogers A. F., S. of M. Quar., 23, 336 (1902). 



63 Schnorr, Wissensch. Beil. z. Programme des Realgym. zu Zwickau, 16 

 (1896). 



