36 



ZOOLOGY. 



<?IT> 



cavated a month aad a throat leading to a so-called stomaeli 

 ■or digestive cavity. Two lioUows in the body form the con- 

 tractile Tcsicles, 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 {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 S. " " 

 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, nest the convex 



Fis. 25.— SfOT'or jwiymorpAtu, magnified IW back, ■wll'.lit the general 

 diamrters. expandwl aiiJ bent slighQy over to- „„„;^_ „f t-1,„ -hni\^ lif>a >if> 

 ■waid the observer; the month Bi. next the eye, Cavirv 01 ine DOQV UCa 06- 

 and the dotsal edge in the distance, d.poste- ^ rliecp ttta " TVip 



rior end; «ft, the tube encloan" J ; e, the ciU- tween tUe=e TWo. ±ne 



ated border of the disk («); r, Uie larger rigid nn-on-s in the fionrfi rPTirP- 

 ciHa: cr, the contractile vesicle in the extreme <"i"» - *" >■"« iigure reprc- 

 distance^seen through Che whole thickness of the ^^^\ the COUr-^e of the T)ar- 

 bodj; cr*. CT*, the posterior prolongation of «?. " _ _ ^ " "^ 



In the distance; r, r', the circniar and radiating ticleS of indigO with which 

 bratche- of what, by Clark, was Bnppoeed to be *^ 



a rudimentary ner^'ou-s ^JStem: n, 7**. the re- Clark fed hlS Specimens, 

 productive svstero. extending from the right , . , -l ■ i j 



Eide, at n, posteriorly, but toward the eye at »'. " " as they are Wnirlea 



~ along, by the large vibrat- 



ing cUia i') 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 



