G. PLEXAURA. 
213 
pedicelled and urceolated at the summits of the 
branches. 
N orway. 
SCARLET. 
52. Gorgonia coccinia. Branching ; branches 
short, dispersed, and formed like Cladonias (some 
exotic lichens) ; axe horny ; rind scarlet ; height from 
three to five centimetres. 
Australasia. 
RED. 
53. Gorgonia coralloides. Upright, and almost 
dichotomous ; polypi projecting, and starry ; rind 
red. 
Mediterranean. 
PLEXAURA. 
Tree-formed Polypidom, branching, and fre- 
quently dichotomous ; branches cylindrical and stiff ; 
axe slightly compressed ; rind in a state of desiccation 
corky or earthy, very thick, effervescing but slightly 
with acids, covered with numerous large and scat- 
tered cells, unequal in size, and which never project. 
These Polypidoms differ from the two succeeding 
genera by the form of the polypean opening, always 
projecting in the Euniceas and Primnoas, but never 
in the Plexauras. It cannot be confounded with the 
