[ *02 ] 
appendices (P. a, a , M. a , #,) which iftue out of it 
on both fides. The two rows of thefe have their di- 
rection nearly on the fame plane. The rays are 
fomewhat fatted, (A/, a , a,) and a trough (A r . c, 
M. n, o ,) rifes out of their center, fomewhat widen’d 
at its beginning, with an opening or great mouth at 
top (M. «,). In its fides there are eight upright 
ridges, broad and elevated, and as many wrinkles, 
or furrows j and each ray is inferted between every 
two wrinkles [M. a , a,). 
§ 29. This trough is placed upon a fmooth part, 
(Fig. N. g,) which we may call the belly of the ani- 
mal ; and this part, while the animal lives, and has 
not been hurt, is always ercCt in the cellule ; tho* it 
be intirely difengaged, and feparated all fides, from 
the faid cellule ; as may be plainly feen in fome po- 
fitions of the polypus. 
§ 30. All thefe particularities are to be feen only 
when the coral is juft drawn out of the fea, and dif- 
fer'd to ftand in fome of the fea-water : for, if you 
take the coral out of this water; or even if you do but 
touch it in the water, the polypus immediately retires 
into his cellule. In retiring, it contracts itfelf, 
the trough is clofed up (Fig. A/, zz, 0 ,) and each ray, 
(J^. C J as a ^° eac h appendix (Q,a, a, a, a ,) fhrinks, 
and enters into itfelf, juft as fnails pull in their horns : 
each ray pulls in about half its length, and with their 
ends they adapt themfelves to the edges of the 
trough (Fig. T. R.). 
§ 31. It is in this pofture, that the polypus is feen 
the moment the coral is drawn out of the fea. The 
polypus , in this contracted ftate, feen without a micro- 
icope, refembles a drop of milk 3 and this is what 
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