122 A NURSERY FOR THE MICROSCOPE. 



lecting bottle. We have magnified one of the fans to 

 show how closely the individual diatoms are packed on 

 the summit of the jelly-like or protoplasmic stalk. 



Fig. 82. 



Fan of Lieomophora. 



Among the lower species of animal life which may 

 be transferred from the pond to the aquarium are 

 the Amcebas, rotifers, fresh-water polyzoa, hydras, 

 water fleas, cyclops, infusoria, &c. The fresh-water 

 sponge (Spongilla flnviatilis), although common in 



