CALCITES OF NEW YORK 107? 
are pyramidal-scalenohedral in habit. The combination shown in figure 
2 is essentially the same as that figured by Penfield and Ford in figure 1 of 
their paper. This combination is characterized by the pyramid y (8.8.16.3) 
and the positive scalenohedrons K: (2131) and M:(7.4.11.3) developed to 
the extent of dominant forms. The prisms b(1010) and a(1120) are 
present as relatively small planes. The polar edges of y are truncated in 
the positive sextants by narrow, brilliant planes of m. (4041), and the 
polar edges of M:are beveled in the negative sextants by narrow, 
somewhat roughened planes of tho negative scalenohedron 9 (1231). The 
two beveling planes of this latter form were apparently assumed by 
Penfield and Ford to correspond to the single plane of the rhombohedron 
(0.12.12.5) from which, however, they were unable to obtain satisfactory 
reflections. 
The combination shown in figure 3 differs mainly from the preceding 
habit in the absence of the scalenohedron M: and in the presence of the 
rhombohedrons p. (1011) and 8. (0112) in termination. A small but distinct 
plane of the positive rhombohedron s. (13.0.13.1) was noted on one 
crystal. 
In the combination shown in figure 4 the scalenohedron M: is present 
as a dominant form and K: is reduced to a series of small faces modifying 
the termination between M: and p. The polar edges of K: are here trun- 
cated in the negative sextants by narrow bright planes of the negative 
rhombohedron ¢. (0221). 
Type III [pl. 18, fig. 5; 6]. Crystals of this type occur in a loosely 
compacted mass deposited on a layer of crypto-crystalline carbonate of 
lime occupying the space between the crystallized calcite and the limestone 
wall of the cavity or vug to the depth of about 5 millimeters. The calcite 
crystals are piled upon this crystalline layer to the depth of from 10 to 15 
millimeters, the largest individuals lying in the top layers. The order and 
manner of deposition suggest the possible derivation from a solution which 
originally completely filled the space and deposited its dissolved carbonate 
of lime first from a rapidly then from a slowly crystallizing medium. The 
