36 



ZOOLOG T. 



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 an- 

 other cavity 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 {H ) 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 oijposite 

 side, next the convex 

 back, whilst the general 

 cavity of the body lies be- 

 tween these two." The 



ated border of thediBk(5); «, the 'largei- rigid jirrovvs in the fio-iivp vpnrp- 

 ciliii; ra, tlie contractile vesicle in the extreme '"J^O"*' "^ ''"« ngUieiepiB 

 dii-tance.Beeu through the whole thickuessof the ggi;^|; tj^g COUrSC of the par- 

 body; C!)', ev^, the posterior prolongation of cv, ^ 

 the distance; r, ?■', the circular and radiating ticlcs of iudigO witll wllich 

 i' Clark, was supposed to be ^, , „ ^ , . 



rphus, magnilied 130 

 dianieters, expanded and bent sligliUy over to- 

 ward the observer; the mouth m, next the eye, 

 and tile dorsal edge in the distance, a, poste- 

 rior end; sh, the tube enclosing « ; c, the cili- 



fed his specimens, 

 they are whirled 



branches of what, by Clark, was KuppOL ^^ .,„ 



a rudimentary nervous system; n, n^, the re- Clark 



productive system, extending from the right 



side, at 7i, posteriorly, but toward the eye at n^. aS 



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 



