\CORALLINE, 235 
. The simple isolated state of the animal, whose phases of develop- 
ment we have indicated, does not last long. It possesses the property 
of. ‘producing new beings, as we have already said, by budding. But 
Fig. 93.+Young Coral Polyp attached to a'Rock, ' Fig. 94.—A Rock covered with young Polyps 
and expanded. (Lacaze-Duthiers.) ‘ and Polypidom. (Lacaze-Duthiers.) 
Fig. 95.— Corpuscles from which originate Fig. 96,—First form of the Polypidom. | 
a the Polypidom. (Lacaze-Duthiers, ) 
how is the polypidom formed? If we take a very young branch, we 
find in the centre of the thickness of the crust a nucleus or stony 
substance resembling an agglomeration of spicula, When they are 
sufficient in number and size, these nuclei form a kind of stony plate, 
