26O ZOOLOGY. 



5. What members of the group of mollusks are economically 

 important? Indicate in what way and to what extent? 



6. A report on all the mollusks to be found in your com- 

 munity; their distribution, habits, etc. 



7. Formation of pearls, and pearl fisheries. 



8. The industries connected with the use of the shells of 

 the clam. 



9. The life history of the fresh-water clam. 



10. The life history of the oyster. 



