1/2 M. P. Dujardin on the Digestive Organs of Infusoria. 



produced without any alteration the figures of five Bpecies, 

 previously represented with an intestine much expanded, and 

 has moreover added, as also showing this organ, the figure of 

 Trachelium ovum already described in L833 (third memoir), 

 with a large sunk band in the centre, and whence proceed 

 very thin ramifications, anastomosing, which truly lias no re- 

 lation to the primitively supposed intestine so contractile and 

 so difficult to perceive. He has also figured an intestine more 

 or less complete in several VorticeUintB, and this intestine di- 

 lated uniformly in some is represented in the figure of one of 

 them [Epistylis plicatilis) as being from time to time inflated, 

 as it" the stomachs, instead of being appended in raceme, were 

 arranged one after the other. With respect to the figure of 

 Paramecium Aurelia, with a curved intestine, he himself re- 

 marks, that it is only an ideal figure. While declaring that 

 it is only in seven species, four of which are Vorticellims, in 

 which he has been able to distinguish plainly the intestine so 

 as to be able to draw it * ; he enumerates among the four spe- 

 cies in which he had been able to trace it only from the suc- 

 cessive passage of the nutriment, precisely the two Infusoria 

 given in 1830, as having been the first that exhibited the in- 

 testine to him ; moreover he has placed by the side of his old 

 figures of Leucophra some new ones which seem to contradict 

 themf. It will also be noticed with what urgency the author 

 recommends the Vorticeliince for the verification of this im- 

 portant fact, and the tendency which he has always shown to 

 neglect representing the intestine in those species which he 

 had cited in his first memoir as having been the first in which 

 he had noticed this organ ; thus, the example of Leucophra 

 loses a great part of its value by comparison with the new 

 drawings, the Paramcecia have furnished but an ideal figure, 

 and the Kolpodea have never been represented by him with 

 any intestine whatsoever. 



Can the analogy of the Rotatoria or Syntolides, &c, be 

 called in aid, as has been already done, to prove the existence 

 of an intestine in Infusoria, in which it is not even possible 



Die Infusionsthierchen, von Ehrenberg, 1838, p. 362. 

 t Die Infusionsthierchen, von Ehrenberg, 1838, PI. XXXII. fig. 1,2, 

 S, 1, 6. 



