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CLASS L— ORDER II. 
seen at the bottom of the cell, dried, in the form of a 
little opaque globule. 
The substance of the Dynamenas is membranous 
or horny. 
In the bosom of the sea they are adorned with 
brilliant colours, which fade or disappear by exposure 
to air and light. 
All the species, with the exception of the Opcrcu- 
lata, scarcely reach a few centimetres in height, al- 
though their growth appears rapid : they are usually 
parasites on the Thalassiophytes, or the other marine 
productions of the different seas that cover the face of 
the globe. 
OPERCULATED. 
1. Dynamena operculata. Cells oval, and closed 
by a lid terminating in a sharp point. 
Seas of Europe and America. 
WILD PINE. 
2. Dynamena pinaster. Stem simple, pinnated 5 
pinules alternate ; cells curved. 
EVANS’S. 
3. Dynamena Evansii. Branches opposite ; cells 
very short; ovaria lobed and opposite. 
Coast of England, near Yarmouth. 
SERTULARIOUS. 
4. Dynamena sertularioides. Stem thick, short, and 
branching ; branches alternate ; cells often nearly al~ 
