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EXPLANATION OF 
8, Halimeda tuna , p. 139. 
a. Of the natural size. 
B. Of the natural size. 
PLATE XIL 
Fig. 1. Udoteajlabrilata, p. 141. 
Of the natural size. 
2. Melobesia pustulata , p. 142. 
a. Polypidom of the natural size, on the Chou 
drus polymorphus. 
B. The same, magnified. 
3. Melobesia farinosa, p. 142. 
Of the natural size, on a fucus leaf. 
4. Alcyonium lobatum , p. 243. 
a. Of the natural size, and dried. 
B. The transverse cut of a branch, also dried. 
PLATE XIIL 
Fig. 1. Alcyonium lobatum , p. 243. 
a. The entire Polypus out of its cell, with its 
tentacula a little expanded, although en- 
closed within a membrane. 
B. Polypus wholly- expanded, the upper part. 
C. One of its tentacula detached. 
D. Polypus expanded at the opening of its 
cell. 
E. Polypus contracted. 
F. Vertical section of an expanded Polypus. 
