PLATE XXV. 



Figures magnified .500 diameters. 



PAGE. 

 Fig. 1. XANTHIDIUM ANTILOPAEUM, Var. triquetrum, front view, . 101 



" 2. triangular end view, 101 

 " 3. zygos|)ore with the empty semi- 

 cells attached, . . 101 



" 4. XANTHIDIUM FASCICULATUM, . . . . .101 



' 5. in process of dividing, . 101 

 Figs. 6, 7. a semi-cell in two views, develp- 



ing a sort of spore without con- 

 jugation; an abnormal process, 102 



Figs. 8, 9. XANTHIDIUM TETRACENTROTUM, front and end vi*-ws . U2 



" 10, 11. RECTOCOKNUTUM, front and end views, . 102 



