28 
Fig. 19. 
ZOANTIIARIA. 
This group embraces the true or polyp corals, the higher forms 
of jelly-fishes, Cterwphora, and sea anemones. Coral, as seen in 
collections, represents only the skeletons of the animals which 
form it. During life it is covered by a thin coating of gelatinous 
or fleshy substance, which constitutes the animal and contains or 
composes the organs which secrete the coral substance, as the true 
bony skeleton of the higher animals is secreted ; not being formed 
by insects, as usually stated. In compound corals each tube, cell 
or center of radiation forms the base of a separate individual or 
center of individual functions ; while all are connected by the 
general envelope of the colony. The larger single corals, having 
only a single cell, or center of radiation, are single or independent 
individuals. During life the fleshy covering and organs are often 
of the brightest colors ; which, with their symmetrical form, cause 
them to resemble flowers of the most beautiful patterns. The 
following figures represent different types of corals, all of which 
may be found in the collection. 
