G. CYMODOCEA. 
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matter, with which the numerous Polypi placed on the 
surface of the stem are connected : this circumstance 
retains it in the second order ; it is in reality an inter- 
mediate between the two. 
The Cymodoceas are either simple or slightly 
branching. 
Their substance horny, rather transparent, and fra- 
gile. 
Their size varies as well as their colour, which is 
sometimes a reddish fawn, at other times lighter and 
more bright. 
They adhere to solid bodies by a fine fibrous and 
extended base, from which issue the stems, or rather, 
on which the stems spread and twist before they rise. 
One species has been brought from the Antil- 
les, and another from the English coast, which two 
constitute all of the genus as yet known : the spe- 
cies will probably prove more numerous, when more 
frequently collected and attentively observed. 
SIMPLE. 
1. Cymodocea simplex. Base branching ; stem 
simple, and slightly undulated ; cells alternate, long, 
and filiform ; colour, a yellow fawn ; height, ten or 
twelve centimetres. — Plate 7. fig. 2. a. A. 
England and Ireland. 
BRANCHING. , 
2. Cymodocea ramosa. Stem a little branching ; 
cells opposite at each ring ; colour, a brown fawn ; 
height, three or four centimetres.— Plate 7. fig. 1. a. A. 
Antilles. 
