Corals. 



25 



that the " pio-holes " in the yellow flesh of the sea-fan 

 are the places where the living animals were. 



The sea-fan and the red-ooral, as well as the others stndied, in- 

 crease by bndding, bnt in all these, each separate colony starts 

 from a single egg. 



Fig. 8. 



Fig. 9. 



The lesson ends with a comparison of the stony corals 

 and the sea-fan, which the children afterwards write out. 



Fig. 8 represents a coral like the sea-fan in strnotnre, in which 

 the branches do not interlace. Fig. 9 is the organ-pipe coral with 

 its green polyps expanded above the red tabes. 



