450 



BIOLOGY OF THE PROTOZOA 



in the digestive tract, but the free forms mainly in the gall and 

 urinary bladders, the tissue parasites mainly in the connective and 

 muscular tissues. The free forms produce no evident harmful effects 



^LA--^fu 



Fig. 188. — Internal luids or " gemmules " of Si^hcerospora dinwrpha, a myxosporidian. 



(After Davis.) 



