PLATE VI. 



DINAMCEBA MIEABILIS. Magnified 250 diameters. 



Figs. 1-3. Threo views of the same individual. Fig. 1. As first seen, in the act of swallowing 

 portion of a desmid {J)idymopnum grevillii). Fig. 2. As observed shortly afterwards, with the nnswal- 

 lowed portion of the desmid detached and rejected. Nearly at the same moment the creature discharged 

 from behind and to the left a portion of a cord of the same desmid, with its segments still conjoined, 

 together with many isolated segments of the same and a few of another desmid {Bamiusina ireiisaonii). 

 In the discharged desmids the internal endoehrome masses are shrunken and turned brownish-yellow. 

 Fig. 3. The animal as it appeared in movement eight hours subsequently. Absecom mill-pond, New 

 Jersey, October, 1876. 



In fig. 2 the Dinamceba is represented with its transparent ciliated mantle or investment, hut this 

 is not reiireseuted in the others. 



Fig. 4. An individual swallowing two portions of the desmid Didymoprium, which entered to the 

 left of the posterior papillated extremity. Atco, N. J., September, 1877. 



Fig. 5. An individual, in motion from right to left, from the same gathering. Viewed by par- 

 tially reflected hght. 



Fig. 6. An individual closely embracing by its posterior widely expanded extremity a cord of 

 Didymopiium. Found with the preceding. 



Fig. 7. An individual, from the same gathering, as it appeared in the discharge of a multitude 

 of isolated segments of Didymoprium from three different points simultaneously. The three points 

 are indicated by protrusions of clear ectosarc and a single desmid segment. 



