DESCRIPTIONS OF THE PLATES. 



401 



DESCRIPTION OF PLATE III. 



Sphaleromyces Lathrobii Thaxter. 



Fig. 1. Mature peritheciurn seen in optical section, showing dorsal view, the ascogenic cell with 

 attached asci lying free in the cavity of the peritheciurn. The ascogenic cell itself lies on the 

 opposite side, and is not seen in the figure. ^ 2. 



Fig. 2. Terminal portion of a somewhat younger peritheciurn seen laterally in optical section. 

 A 2. 



Rhizomyces ctenophorus Thaxter. 



Fig. 3. Ascogenic cell with attached asci showing oblique position of the mass as it lies free 

 in the cavity of the peritheciurn. Only a small portion of the spore mass is shown, which fills the 

 cavity of the peritheciurn above the ascogenic cell, the spores being freed through the sloughing off 

 of the asci as they mature from the upper portion of the ascogenic cell (at x), and the absorption 

 of the ascus wall. J 2. 



Laboulbenia Hageni Thaxter. 



Fig. 4. Portion of the soft integument from the abdomen of a white ant, bearing a pair of 

 individuals, inverted so as to show the attachment of the foot as it appears when viewed from 

 below. J 4. 



Laboulbenia inflata Thaxter. 



Fig. 5. Portion of the hard chitinous integument from the leg of Bradycellus, showing seven 

 pairs of individuals in various stages of development, and illustrating the abortion, characteristic of 

 this species, of one member of the pair. C 2. 



Laboulbenia Diopsis Thaxter. 

 Fig. 6. Mature individual of average dimensions. A 12. 



Laboulbenia proliferans Thaxter. var. liberiana. 



Fig. 7. Mature individual of the Liberian variety, the proliferous appendage having the black 

 indurated base. A 12. 



Laboulbenia Aspidoglossai Thaxter. 

 Figs. 8, 9. Mature and young individuals. A 12. 



Laboulbenia elongata Thaxter. 



Fig. 10. Individual treated with potash, showing the general envelope ruptured by longitudinal 

 and transverse slits exposing the cells within. A 4. 



Fig. 11. Portion of an individual similarly treated. Cells II, III, and VI seen in optical section 

 protruding from the ruptured envelope. The dots on the surface of the latter correspond to the 

 points of attachment of the fibrillse which arise from the inner layers of the cell-walls on the 

 surfaces next to the envelope. The protoplasmic connection of the different cells is indicated. D 2. 



26 



