422 
DESCRIPTIONS OF THE PLATES 
DESCEIPTION OF PLATE XX 
Lahoulbenia BracMni Thaxter. 
Fig. 1. Short form with appendages well developed. 
A 12. 
Fig. 2. Elongate form with exceptionally simple appendages. A 12. 
Figs. 3, 4. Young individuals. D 2. 
Figs, 5, 6. Young individuals. D 4. 
Fig. 7. Fertile branch with characteristic group of antheridia. D 12. 
Fig. 8. Spore. D 4. 
Laboidbema Pachytelis Thaxter. 
Fig. 9. Mature individual with abnormal septa in cells I and II. A 12 
Fig. 10. Mature individual, shorter form, A 12. 
Fig. 11- Fertile appendage with two antheridia. D 12. 
Fig. 12. Spore pair. D 4. 
Lahoulbenia Pheropsojyhi Thaxter 
Fig. 13. Mature individual. A 12. 
Antheridium. D 12. 
Fig. 14. 
Fig, 15- Spore pair. 
Lahoulbenia texana Thaxter 
Fig. 16. Mature individual. A 12. 
Fig. 17. Young individual. 
Fig. 18. Antheridium. , D i2. 
A 12. 
Lahoulbenia decipiens Thaxte 
r 
Fig- 19. Mature individual. A 12. 
Fig. 20. Antheridium. D 12. 
Fig. 21. Spore. D 4. 
i 
4 
I 
