16 ANIMAL ACTIVITIES. 
Chapter XIII. Keep one animal in each battery-jar 
with sea-water and a few marine plants. 
Sea-cucumbers. These animals are often found on 
beaches after a storm. They may be found on rocky 
bottoms in a depth of from three to six feet of water at 
2 ———— = = 
Fic. 22.—Sea-anemones. 
low tide. It is easy to take them with a dip-net when 
once found. They are hardy and live well in aquaria. 
Compare with starfish and sea-urchin. 
Shrimps and Sand-fleas. Shrimps may be used in- 
stead of crayfish in studying Chapter X. They may be 
caught with a dip-net in shallow water at low tide. They 
can be kept in aquaria. Sand-fleas, sometimes called 
