PLATE L. 



FIG. 



1. Orisidia cornuta, j>. 287. Of the natural size. 



2. A portion of the same magnified. 



3. 4. Crisia eburnea, p. 283. Of the natural size and mag- 



nified. 



5, 6. Crisia denticulata, p. 284, Of the natural size and 

 magnified. 



7. Anguinaria spatulata, p. 290. Of the natural size, 



parasitical on a confervoid alga. 



8. A portion of the same magnified. 



.9, 10. Hippothea catenularia, p. 291. Of the natural 

 size and magnified. 



