274 



EXPLANATION OF THE PLATES. 



PLATE I. 



Fig, 1. Cellepora ovoidea, p. 38. 



a. The natural size, on the leafof a marine plant. 

 B. Cells magnified. 



2. Cellepora labiata, p. 39. 



a. Groups of cells, of the natural size, on afucui.^ 



B. Cell magnified, seen sidewise. 



C. . .in front. 



D. . . truncated. 



3. Cellepora Mangnevillana, p, 39. 



a. Of the natural size, on the Fucus hirsutus 



of Linnseus. 

 B. Cell magnified. 



4. Flusira pyriformisj p. 45, 



a. Of the natural size. 



B. Fragment of a branch, magnified. 



5. Flustra eriophora, p. 48. 



a. Groups of cells, of the natural size, on a 



fucus leaf. 

 B. Cells magnified. 



6. Flustra mamillaris, p, 49. 



a. Groups of cells, of the natural size, on a 



marine plant. 

 B, Cells magnified. 



