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BIOLOGY: GENERAL AND MEDICAL 







4 



FIG. 24. Spiral path of Paramre- 

 cium. The figures 1, 2, 3, 4, etc., 

 show the successive positions oc- 

 cupied. The dotted areas with small 

 arrows show the currents of water 

 drawn from in front. (Jennings.) 



FIG. 25. Diagram of a sagittal section 

 of a Rotifer. 6, Brain; bl, excretory blad- 

 der; c, cloaca, the common opening of 

 digestive and reproductive organs; co, 

 ccelom; e, eyespot; ex, excretory canal;/, 

 flame cells; f.g, foot gland; ft, foot; g, gut; 

 w, mouth; m.f, longitudinal muscle fibres; 

 mx, mastax; o, ovary; ph, pharynx, s.g, 

 salivary gland; t, tentacle; tr, trochus, 

 or cilia-bearing disc. (Galloway.) 



