PLATE XX. 



ASTRORHIZA. 



Diam. Page 



Figures 1-9. — Astrorhiza crassatina, Brady, .... 233 



Figs. 1-4. Lateral aspect; fig. 5, terminal aspect, 



showing one of the apertures, . . x 8 



Figs. 6-8. Specimens laid open, showing the sub- 



segmented interior, . . . x 8 



Fig. 9. Portion of the surface more highly magnified, . x 100 



,. 10-13. — Astrorhiza angulosa, Brady, . . . x 8 234 



Figs. 10-12. Lateral aspect. 



Fig. 13. Specimen laid open, to show the interior. 



.. 14-23. — Astrorhiza granulosa. Brady, .... 234 



Figs. 14-18. Lateral aspect; tigs. 19, 20, terminal 



aspect, . . . ■ . x 8 



Figs. 21, 22. Specimens laid open, showing the tubular 



cavities, . . • . x 8 



Fig. 23. Portion of the surface more highly magnified, x 100 



