10 



COMPARATIVE ANATOMY 



CHAP. 



FIG. 14. Stylonychia mytilus, after Stein 

 (from Claus's Zoology), seen from the ventral' 

 surface. Wz, Adoral ciliated zone ; C, contractile 

 vacuole ; N, nucleus ; N", micronucleus ; A , anus. 



FIG. 15. Stentor Roeselii, after Stein 

 (Claus's Zoology). 0, Oral opening with oeso^ 

 phagus ; PV, contractile vacuole N, nucleus. 



FIG. 16. Vorticella microstoma, after Stein (from Claus's Text-book of Zoology), a, Dividing 

 longitudinally ; N, nucleus ; b, after complete division one part severs itself after having formed 

 a ring of cilia behind ; w, oral ciliary organ ; c, vorticellse in conjugation ; t, the adhering bud-like 

 individuals. 



