Explanation of Plate XXIX. 



Fig. i. Crystal of Type 2. 

 Joplin Calcite. 

 One-half natural size. 

 Mus. No. M5515. 



Fig. 2. Completed ideal form of crystal 

 shown in Fig. I. 



Fig. 3. Crystal of Type 3. 

 Joplin Calcite. 

 Mus. No. M5511. 



Fig. 4. Crystal of Type 5. 

 Joplin Calcite. 

 Mus. No. M5824. 



