1893.] 



MICROSCOPICAL JOURNAL. 



287 



and active movement towards its capture, Future observations 

 may bring to light many new and curious facts as to the behav- 

 ior of Amceba when brought into contact with other forms. 

 Prof. Joseph Leidy, in his fine work on Fresh-water Rhizopods, 

 relates a case where he witnessed an Amoeba swallow and di- 

 gest one of its own kind. He also notes the occurrence of the 

 partly digested bodies of Rotifers within Amoebas, but does not 

 speak of having witnessed their capture. 



On a former occasion the writer was fortunate enough to see 



FIG. 8.— THESAMESTENTORAS IN FIGURES 6 AND 7 FINALLY ESCAPING FROM ITS 

 CAPTORS. 



FIG. 9.— ONE OF TWO AMCEBA8 ENDEAVORING TO CAPTURE A STENTOR WHOSE 

 HINDER PART IS BULGED INTO A SPHERICAL MASS. THE OTHER AMCEBA TAKES 

 NO PART IN THE CONTEST. 



an Amoeba make repeated but fruitless efforts to get a Rotifer 

 within its clutches. The latter is a larger, stronger and more 

 highly organized animal than Stentor. In this case, inarching 

 and interlacing arms closed around the Rotifer in an attempt 

 to entangle him. The latter escaped and was again encircled 

 by new arms only to escape them a second time. When last 

 seen, the Rotifer had boldly attached his foot to the body of the 

 Amoeba, and kept right on gulping down and crunching the 

 smaller organism which formed his own food. One might eas- 



