38 Lessons in Zoology. 



Both egg- plates and e;e-plateg are dif&onlt to make out clearly, 

 except on large specimens of the common sea-egg, bat both 

 are shovn beantifnlly on the large Mediterranean sea-urchin. 



Each child should now draw such la section of the 

 shell as is represented in Fig. 3, consisting of two rows 

 of perforated plates with one row of large plates on each 

 side of them, and the central disk surrounded by its 

 circle of plates. 



Lesson III. 



When we go to the seashore, where shall we look for 

 star- fishes ? 



In tide-pools. On the rocks under water. On oyster 

 and mussel beds. 



Where shall we find sea-urchins ? 

 In tide-pools. On rocks under water. Sometimes 

 hidden under stones and gravel in the water. 



What did we find on the star-fish ? 

 Short spines. A sieve. Tube-feet. A mouth. Five 

 eyes. Five nerves. Tiny specks of forks. 



What have we found on the sea-urchin ? 



Long spines that will move. Tube -feet. A sieve. A 

 lantern. Five teeth. Lots of forks with handles. Five 

 holes where the sea-urchin had eyes when it was young. 

 Bows of small plates with holes in them. Bows of laxge 

 plates. 



How many rows of each ? 

 Ten rows of each. 



