444 



THE PROTOZOA 







K 



FIG. 186. Details of the structure of the ciliary and contractile apparatus of 

 Ciliata. A, Two isolated cilia of Stentor'e&ruleus, showing the deeply-stained 

 proximal portion, of even thickness throughout, and the lighter distal portion? 

 tapering to a point ; magnified 2,250 diameters ; B, section through the surface 

 of the body of Prorodon teres, showing the cilia arising from basal granules 

 (&.<?. ). situated above canals (c.wi.), at the base of which run the myonemes (m.), 

 seen in transverse section ; C, section through the mouth of Prorodon teres 

 (Fig. 14), showing the rod-apparatus (R.}, each rod with two myonemes 

 (m.r., m.r. 1 ) ; N., nucleus ; D, section of the body-surface of Paramecium 

 caudatum, showing the cilia arising from basal grains : T,, trichocysts ; /.., 

 food-vacuole ; E, section through the mouth and oesophagus of Paramecium 

 caudatum, showing the undulating membrane (u.m.) in the oesophagus: 

 other letters as in D ; F, section through the adoral zone of Nyctotherus 

 cordiformis, showing the membranellae (ml.) cut across, each composed of two 

 cilia arising from a pair of basal granules ; 0, section of the adoral zone of 

 Stentor niger, showing a membranella (ml.), composed of fused cilia arising 



[Continued at foot of p. 445. 



