ZOOLOGY. 



cv 1 



S 

 CV 



m 



n 



cavated a mouth and a throat leading to a so-called stomach 

 or digestive cavity. Two hollows in the body form the con- 

 tractile vesicles, and a 

 central mass constitutes 

 the reproductive organ. 

 Prolongations of the body- 

 mass form the cilia, which 

 characterize the Infusoria 

 and give the name to the 

 present order, Ciliata. 

 Paramecium has an elon- 

 gated, oval body "with 

 one end (II) flattened out 

 broader than the other, 

 and twisted about one 

 third way round, so that 

 the flattened part resem- 

 bles a very long figure 8." 

 In this form, as well as in 

 Stentor (Fig. 25), as Clark 

 remarks, " we have the 

 mouth at the bottom of a 

 broad notch or incurva- 

 tion, and the contractile 

 vesicle on the opposite 

 side, next the convex 



Fisr. "St.Sten'or jxAynwrphu*, minified 130 back, whilst the general 

 diameters, expanded an. I bent slighuy overto- f 4.1 i IT i 



ward the observer; the mouth 771, uext the eye, Cavity OI tilC DOUy 116S D6- 

 and the dorsal edge in the distance, d poste- j. fhpep two" TllP 



nor end; sfl, the tube enclosing I ; c, the cili- L\vu. 



ated border of the disk (*); v, the larger rigid arrow o ir) flip fieri rp rpnrP 

 cilia; cv, the contractile vesicle in the extreme d 



distance.seen through the whole thickness oi 'the sen {; the COUl'SC of the par- 

 body; cy l ,cv*, the posterior prolongation of cv, 



in the distance; r i ', the circular and radiating tides of indiffO with which 

 branches of what, by Clark, was supposed to be 



& rudimentary nervous system; it, //', the re- Clark fed lllS Specimens, 

 productive system, extending from the right , . ' 



tide, at n, posteriorly, but toward the eye at n 1 . as they are whirled 

 After Clark. , ij.ii -i 



along, by the large vibrat- 

 ing cilia (v) of the edge of the disk, against the vestibule of 

 the mouth." During the circuit the food is digested, a 

 mass of rejectamenta is formed near the protuberance, a, 

 which has appeared a short time before. This finally 



