MEMORANDA. 167 



indigo ; seen tliem fjradualltj become filled with that sub- 

 stance, and afterwards resume their transparent appearance, 

 as the diijested matter was ejected in a stream from the pos- 

 terior orifice of tlie animalcule. After careful and repeated 

 observations, I feel satisfied that no bowel exists (for a blue 

 line, however faint, would in that case be visible). 



This genus is somewhat allied to KoJpoda, the one investi- 

 gated by Dr. Poucliet ; and I can, therefore, confirm his 

 opinion, with the additional observation, that I have found 

 each stomach to be provided with a little circular aperture for 

 the admission of food. 



This does not, however, invalidate the theory of Dujardin j 

 for, after reading Dr. (John's account of the rotation in Loxodes, 

 I carefully examined Chelodon aureus, a similar type, and 

 found his observations to be perfectly applicable to this 

 animalcule, with only one difference, namely, tiiat the granules 

 take two different directions from one side of the body, and 

 meeting at the opposite side, are there lost in the general 

 substance of the body. I have also clearly traced the rotation 

 of granules in Steator viridis (^S. polymorphus, Ehrenberg). 



If these observations be correct, it follows that the two 

 parties before alluded to have examined two different types. 



Dr. Pouchet (for Elu'enberg's theory is too sweeping) has 

 stutlied, and accurately described, the structure of Kolpoda, 

 Vorticella, &c. ; whilst Dujardin, Cohn, and others, have 

 correctly observed Chelodon, Loxodes, Nassula, and that type 

 of Animalculae. 



My investigations were made with a good, clearly-defining 

 microscope, manutaclured by Schieck, of Berlin, and with 

 powers varying from 200 to 900 diameters. — James Samuel- 

 son, Hull. 



