Fig. 15. — Diagrams illustrating shifting of the mouth in ciliates from terminal to 

 lateral or ventral surface (A, B, C, D). E, Prorodon griseus, corresponds with A; 

 F, Am.phileptus claparedi, corresponds with B or C; and G, Nassula microstoma, corre- 

 sponds with D. (E and F, after Butschli; G, after Calkins.) 



A 



Fig. 16.— Types of spirally wound Protozoa. A, Streblomastix strix. (After Kofoid 

 and Swezy.) B, Lacrymaria sp. (Original) ; C, Heteronema sp. (Original.) 

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