PLATE LVIII. 



Figures magnified 500 diameters. 



Page. 

 Figs. 1, 2. Staurastrdm tricobndtum, front and end views, . . 159 



" 3, 4. Statjkastbum NovjE C^sarbje, front and end views, . 159 



" 5, 6. SiAUBASTRnM SPONGIOSUM, front and end views, . . 163 



'' 7, 8. " " other form, front and end views, 163 



'f 9, 10. Staurastrdm aroticon, — {M. munitum Wood), . 163 



