110 
arranged. The apertures are very minute, and terminal, and 
cannot readily be seen even with a lens. 
PUMICE-STONE CORALLINE. C. Pumicosa. En- 
crusting, cells ovoid or sub-orbicular, generally heap e 
irregularly together, when young arranged in a quincunx . 
apertures round, armed with three marginal teeth. PI. x* 1 ’ 
fig- 3. 
Porous eschara, Ellis’ Coral., p. 75, pi. 27, fig. f F., pi. 
fig. d, D. Cellepora pumicosa, Turton’s Lin., vol. 4, p. 
Stewart’s Elem., vol. 2, p. 428, pi. 12, fig. 16, 17, cop®" 
from Ellis. Fleming’s Brit. An., p. 532. Templeton 1 
Mag. Nat. Hist., vol. 9, p. 469. Johnston’s Brit. Zoop®> 
p. 273, pi. 32, figs. 1, 2, 3. Bellamy’s Nat. Hist, of Sou 1 
Devon. Millepora pumicosa, Ellis and Solauder’s Zoopb'’ 
p. 135. Turton’s Lin., vol. 4, p. 639. Stewart’s Elen'- 
vol. 2, p. 428. Flustra bullata, Ellis and Solander’s Zoop 
p. 16. Stewart’s Elem., vol. 2, p. 436. Turton’s Lin., vol. > 
p. 664. 
Hab. On stones, shells, and roots of sea-weed, coin® 00- 
Polperro. 
This very common species presents itself under a varie 1 ^ 
of aspects, depending on the character of the substance 
incrusts. As it is most commonly found on Corallines, ^ 
generally resembles globular pieces of pumice-stone, f'' 0 ^ 
whence it derives its name. When living it is of an oral's 
red colour, and sometimes pinkish; but when seen in colla- 
tions, it is of a light dusky brown colour. It is calcareo® > 
porous, friable, and encrusting. The cells are ovato-globo^- 
round, or egg-shaped, depending on the figure of the substa®^ 
it encrusts. The apertures of the cells are armed with ll* r ® j 
marginal teeth, which, from being easily destroyed, are » 
always to be found. In young specimens, encrusting a p 1 '^ 
surface, the cells are always egg-shaped, and regularly 
ranged in a quincunx ; but as age advances, the first lay"* - 
cells becomes irregularly covered with others of a newer 
malion. As this irregidar accumulation of cells is constaD ^ 
going on, the porous friable mass, commonly seen, is * orn ] e e p 
There is a variety sometimes found on shells, which, 
living, has a pearly appearance, which seems to be the Fl liS 
bullata of Linnaeus and Ellis. 
BRANCHED CELLEPORE. C. Ramulosa. PolyP id ° 
calcareous, dichotomously branched; the branches c Uj; 
drical, rough, and obtuse; cells irregularly distribu® 
apertures armed with a spine on the outer lip. 
Cellepora ramulosa, Turton’s Lin., vol. 4, p. 640. EI e j^ 
fog’s Brit. An., p. 532, no, 131. Johnston’s Brit. Z°°P 
p. 274, pi. 32, figs, 4 and 5. 
