L56 SUMMARY OF CURRENT RESEARCHES RELATING TO 



the intestine. A sporozoite attacks an intestinal epithelial cell, pene- 

 trating tn some distance; it enlarges, especially in its free part; it 

 develops ramified fixing and absorbing amoeboid processes. It remains 

 for a long time fixed ; but free forms with epimerites were also found. 

 There are other species : — Polyrhabdina polydorse in Polydnra ciliata, 

 P. brasili sp.n. in Spio m&rtinmsis, and Polydora pygospionis sp. n. in 

 Pygospio setkornis. 



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