134 ANTHOZOA !—STONY CORALS. 
in the accompanying figure (fig. 75). The particular arrange- — 
ment of the radiating plates of the Madrepore (shown at the — 
top of each stem) is the result of the 
form of the soft structures by which 
it was deposited; and wherever we 
see a structure of this kind in coral, 
whether upon a large or a small 
scale, we may infer that it was formed 
by an animal nearly allied in structure 
to the Sea-Anemone. Of the stone 
depositing coral-animals, a large 
number are often associated in a com- — 
pound structure, as in fig. 76; this — 
consists of a stony tree-like stem and — 
branches; but instead of the soft ani- — 
Fig. 75.—Canyornys1t4. “mal matter being contained in its 
interior, as in the Hydrozoa, it usually forms a kind of flesh 
ss 
Fig. 76.—Srem or Corat. : 
that clothes the surface, and connects together the different 
