[631 ] 
ferted in a cell, whofe brim, or border, was furrounded 
by little fpines. 
Thefe cells we obferv’d to compofe that fpongy 
rough matter, which incrufts almoft all marine fub- 
ftances, but chiefly fucus’s. Fig. 4. reprefents the 
natural ftze of thele cells on a fucus ; letter D ex- 
preffes the cells and polypes, with twelve tentaculi to 
each, as they appear magnified ; where the animals 
are feen railing and expanding themfeives. When 
they are difturb’d, they draw themfeives within their 
fheath, or pipe, which clofes on them, and fink to- 
gether into their cells. 
The curious denticulated coralline at «° y. Plate 
XXIII. has very much the appearance of a plant, at 
firft view, even when it is magnified, as at E. This 
gave us a farther corroborating proof, that thefe ex- 
traordinary fpecies of beings are animals : For we 
obferv’d, that the fmaller polypes, that extend them- 
feives out at the opening of every oppofite denticle, 
or little projecting tube, are united at the bottom, or 
lower- part, to the flefhy fubftance of the main body, 
that paffes thro’ the middle of each branch, or ftem, 
and are fo many different bodies united in one ; acting 
like fo many fets of hands, placed in form of a cir- 
cle, collecting food, each for a mouth in the centre, 
to convey nourifhment to fo many ftomachs, which 
are fix’d in the fwelling part, or bottom, of each den- 
ticle. This great fupply of nourifhment from all 
tides, gives that great increafe, and variety of ramifi- 
cations, to this wonderful clafs of many-bodied ani- 
mals. 
Befides thefe fmall polypes, which compofe the 
branches, thefe corallines fend forth, from feveral 
2 parts, , 
