POLYZOA. 
Fig. 21. 
71 
Statoblasts of Freshwater Polyzoa. A, Fredericdla sultena X 38 ; B, Plumatella 
repens X 38; C, Lophopus erystallinus x 28 ; D, Cristatella\mucedo\x 28. 
['The Cambridge Natural History.'] 
Fig. 22. 
A, Plumatella repens, partly free, partly incrusting stem of water-weed. 
|B, Cells magnified. (After Allnian.) 
