8 FIRST BOOK OF ZOOLOGY. 



bottom of rivers and ditches. The dirt having been sifted 

 out, the shells and other objects will be left behind. The 

 dipper may be made as in the figure. 



Fl. 11. DlPPEE ATTACHED TO A WOODEN HANDLE FOR COLLECTING SNAILS. 



Shells collected with the snails inside, and cleaned for 

 the cabinet, are called live shells. They are always more 

 fresh and perfect than dead shells. 



Having made the collection, the snails should be kept 

 alive in a wide-mouthed jar, or bottle, care being taken not 

 to have more than fifteen or twenty in a jar holding a quart 

 of water. 



8. The pupils will have secured some of the following 

 forms : 



FIG. 12. FBESH- WATER SNAILS. 



