PLATE II. 



FIG. 



1. HUXLEYA FRAGILIS, p. 27. After Busk. 



2. BRETTIA TUBJEFORMIS, p. 28. See Plate V. 



3. AETEA TRUNCATA, p. 8 ; erect and pedicellate form. 



4. EUCRATEA CHELATA, p. 14 ; showing the creeping 



line 'of cells, from which the shoots spring. 



5-7. - , showing the primary cell and the first 



stages of the colony. 



primary zocecia. 



