PLATE L. 



FIG. 



1. CRISIDIA COKNUTA, p. 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. 



