610 



PROTOZOOLOGY 



5 anals; marginals; 3 caudals; with short dorsal bristles; fresh or 

 salt water. Many species. 



S. mytilus (Muller) (Fig. 276, 6). 100-300^ long; fresh, brackish 

 and salt water. 



Fig. 276. a, Uroleptus halseyi, X470 (Calkins); b, Stylomjchia my- 

 tilus, X200 (Stein); c, S. pustulata, X400 (Roux); d, S. putrina, X200 

 (Stokes); e, S. notophora, X200 (Stokes); f, Onychodroinus grandis, 

 X230 (Stein); g, Onychodromopsis flexilis, X240 (Stokes); h, i, Eti- 

 plotes patella, X290 (Kahl); j, E. plumipes, X270 (Stokes). 



S. pustulata E. (Fig. 276, c). About ISO/x long; fresh water; 

 nuclear changes studied by Summers (1935). 



