258 



DIPS INTO MY AQUARIUM. 



Stages in a large colony. Mr. Slack describes three modes of 

 reproduction amongst Vorticellids — (i) fission, or division of the 

 body ; (2) budding, analogous to the growth of plants'; (3) by 

 reproductive germs. 



The organism named Acineia 7?iysfaci?ia, by Ehrenberg, was said 

 by Mr. Gosse to be merely one of the developmental stages of a 

 larger Vorticellid. It is a '^ stiff and motionless object," with " tufts 

 of flexible, but inanimate threads " taking the place of the stalked 



