212 MRS. WEBER VAN BOSSE ON PSEUDOCODIUM. 
EXPLANATION OF PLATE I. 
Fig. 1. Pseudocodium De-Vriesei, nat. size. 
2. Peripheral vesicles of Pseudocodium, (a) seen from above, (4) seen 
from the side. Obj. C, oc. 2, of Zeiss. 
3. Section through the top of a branch. Obj. A, oc. 2. 
4, A single tube more enlarged, showing the apical growth. Obj. C, 
oc. 2. 
5, 6, 7, 8, and 9. Different stages of development of the vesicles of 
Codium: 5, end of a tube swelling out in a vesicle; 6, first appear- 
ance of a small protuberance; 7, 8, 9, various stages of the new 
lateral tube. Obj. C, oc. 2, slightly reduced. 
