na.c.c. 





^.g>\/f©)> ,^^^^^ art. 



;r C.C. 



O.W. 



FIGURE 4 



FIGURE 3 



FIGURE 4. STEXOSTOMA LEUCOPS ( AFTER OTt). 



c, cilia, c.p., ciliated pits, cii., cuticula. h., brain, com., brain 

 commissure, d.o., dish-shaped organs, m., mouth. i)li., i)harynx 

 ph.c, pharyngeal cells, e.c, epithelial cells, in., intestine, w.v.t., 

 water vascular tube, r., rods, p., parenchyme. o.w., external open- 

 ing of water vascular tube. 



FIGURE 3. STYLONYCHIA MYTILUS (fROM IIARTOG, AFTER I.AXg). 



a.c, abdominal cirrhi. an., anus discharging the shell of a Diatom. 

 C.C, caudal cirrhi. c.p., dorsal cirrhi. cv., contractile vacuole, e., 

 part of its replenishing canal, f.c, frontal cirrhi. f.v., food vac- 

 uoles, g., internal undulating membrane. 1., lip. ni., mouth or 

 pharynx, mc, marginal cirrhi. X., X., lobes of megaruichnis. n, n, 

 micronuclei. o., anterior end. per., adoral mcml)ranellu\ poc, 

 preoral cilia, p.om., preoral luubdating meml)ran»*. s.h., sense hairs. 



233 



