G. EUNICEA. 
217 
CORKY. 
5. Pl ex aura suberosa. Dichotomous or branch- 
ing ; branches long and diffuse ; cells radiated. 
Indian seas, and Africa. 
BENDING. 
6. Plexaura homomalla . Branches numerous, 
dispersed, and often bowed down ; cells dispersed ; 
rind brown or reddish ; height about three decime- 
tres. 
American seas. 
OLIVE-COLOURED. 
7. Plexaura olivacea. Very branching ; branches 
scattered, and rather pinnated ; rind olive-colour ; 
cells dispersed, and thinly sown ; size about one de- 
cimetre. — Plate 16. 
East Indies. 
EUNICEA. 
A tree-formed, branching Polypidom; axe al- 
most always compressed, particularly at the juncture 
of the branches ; covered with a thick cylindrical 
rind, and strewn with projecting papillae, which are 
always scattered and polypous. 
In this genus the polypi are always placed in pa- 
pillous cells, often several millimetres in length and 
breadth, sometimes rather smaller, and always re= 
Cor. 2 e 
