10 



COMPARATIVE ANATOMY 



CHAP. 



phA 



I; 



t-c 



-N' 

 -V 



i^. 





Fig. 14.— StylonycMa mytilus, after Stein Fig. 15. — Stentor Roeselii, after Stein 



(from Claus's Zoology), seen from tlie ventral (Claus's Zoology). 0, Oral opening with ceso- 



surface. Wz, Adoral ciliated zone ; C, contractile phagus ; PV, contractile vacuole N, nucleus. 



vacuole ; N, nucleus ; N' micronucleus ; ^, anus. 



Fig. 16.— Vorticella microstoma, after Stein (from Claus's Text-l)ook of Zoology), a, Dividing 

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

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

 individuals. 



