Corals. 



19 



The teacher tells them that this is a stony coral, with a 

 skeleton made of lime. Then they look carefully at the 

 top and the sides of the skeleton, to see if it will remind 

 them of any animal they have studied, and find it is like 

 the sea-anemone. 



Some pieces of Galazea will show plainly that there are twelve 

 stony partitions that nearly meet in the center of the tnbe, and 

 twelve more that are shorter, bat the specimen? are often so broken 

 that it is difficult to tell how many of the partitions are long and 

 how many axe short. It is not best to have the children count them 

 unless the teacher knows from personal examination of the tubes 

 that her pupils can readily see how many little walls of each sort 

 there are. 



After the question. How are these tubes held together ? 

 an examination of the teacher's large specimen shows that 

 a stony, white, spongy substance connects them. 



Fig. i. 



Fig. 3 has been put on the blackboard, drawn wholly in red, be- 

 cause it shows only the fleshy parts of the ooral. This is not the 

 Galaxea, bnt it has the same kind of a stony skeleton, and the 

 same arrangement of all the fleshy parts. The children now de- 

 scribe this figure. 



This new coral has a fleshy tube. It has a disk at the 

 top of the tube, with the mouth in the center. It has ten- 

 tacles around the mouth. There are little animals bud- 



