PLATE LX. 



FIG. 



1. CELLULARIA HOOKERI, p. 338. 



2. A portion of the same magnified. 



3. CELLULAKIA NERITINA, p. 340. From a specimen pre- 



sented by W. Bean, Esq. 



4. A portion of the same magnified. 



5. FLUSTRA CHARTACEA, p. 343. From a specimen for which 



I am indebted to Miss Howard. 



6. Some cells of the same magnified. 



7. ESCHARA CRIBARIA, p. 352. Of the natural size. 



8. A few of the immature cells magnified. 



9. A magnified view of what seem to be mature cells. 



