PLATE XIX. 



ASTRORHIZA. 



Diam. Page 



Figures 1-4. — Astrorhiza limicola, Sandahl, .... 231 



Figs. 1, 2. Lateral aspect, . . . x 8 



Fig. 3. Specimen laid open to show the interior, . x S 



Fig. 4. Portion of the test more highly magnified, to 



show the structure, . . . . x 100 



,, o-10. — Astrorhiza arenaria, Norman. .... 232 



Figs. 5-7. Specimens of different forms ; lateral aspect, x 8 



Figs. 8, 9. Specimens laid open to show the interior, . x 8 

 Fig. 10. Portion of the surface more highly magnified, 



to show the constituent sand-grains, . x 100 



