444 



THE PROTOZOA 





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

 Ciliata. A, Two isolated cilia of Stentor-ccerweus, showing the deeply-stained 

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

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

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

 (b.g.), situated above canals (c.m.), at the base of which run themyonemes (m.), 

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

 (Fig. 14), showing the rod -apparatus (B.), 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-vacliole ; 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 Nyctothenis 

 cordiformis, showing the membranellaa (ml.) out 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. 



