OX PYROXENIC COMPONENTS IN CERTAIN VOLCANIC ROCKS. 87 



Explanation of Plate XIV bis. 



Fig. 1. — The crystal of the Rhombic Pyroxene frequently found at 

 Tatsumiura as larger crystals, figured in the position of v. Rath 

 (pag. 74-76). 



Fig. la. — The basal projection of the crystal shown in tig. 1. 



Fig. 2. — The type of the microscopic crystals of the Rhombic Pyro- 

 xene, placed as in tig. 1. (pag. 77). 



Fig. 3. — The crystal as in tig. 1, projected upon a plane parallel to 

 Macropinacoid, the narrow bands of Augite on both sides making 

 parallel-intergrowth with the crystal, as described on pag. 78, the 

 direction of extinction in these bands beim? simultaneous and 

 making 42° with the direction of the vertical axis, as shown by 

 the oblique line. The spines proceeding from the Augite-bands 

 explained on pag. 85. 



Fig. 4. — The crystal, like that of tig. 2, projected as in tig. 3, to show 

 the symmetrical «arrangement of glass enclosures (pag. 79). 

 On the left side are figured elongated enclosures which are some- 

 times arranged parallel to the direction of the vertical axis 



(pag. 80). 



Fig. 5. — The crystal, as that of fig. 4, showing the succession of 

 enclosures conforming to the pyramidal face i. In the lower part 

 of the crystal are figured series of the canal-like figures produced 

 when it is acted on for a long time by hydrofluoric acid (pag. 80). 



Fig. 6. — The penetration-twin of the Rhombic Pyroxene projected 

 as in fig. 3, 4, 5. The two individuals having their brachypi- 

 nacoidal faces in common, and the directions of the vertical axes 

 making ca. 60° (pag. 77). The spines of Augite attached at the 

 angles are found to be running parallel with the face a (pag. 85). 



