PLATE LXIII. 



FIG. 



1. FLUSTRA CARBASEA, p. 345. Of the natural size. 



2. A few of its cells magnified. 



3. FLUSTRA AVICULARIS, p. 346. Of the natural size. 



4. A small portion of the same magnified. 



5. FLUSTRA MURRAYANA p. 347. Of the natural size. The 



specimen I owe to the liberality of Mr. Bean. 



6. A portion of the same magnified. 



6* A few cells more highly magnified, showing the bird's- 

 head appendages, of which there is usually one to each 

 cell. 



7. CELLULARIA AVICULARIA, p. 338. Of the natural size. 



8. A small portion of the same magnified. 



fc * There is no Plate LXIV. nor LXV., an omission arising from an error in the 

 enumeration of the plates. 



