346 LEON AUGUSTUS HAUSMAN. 



spores, and that some of them (those in the anterior portion) were 

 lost. 



M. Popoff ('u) has recorded a type of reproduction in Amoeba 

 minuta, a marine species, similar to the one described above, 

 with the difference, however, that the resulting spores were 

 gametes, which later fused. Schmidt ('13) likewise, described 

 this same sort of reproductive activity as occurring in another 

 marine species, Amasba aquitalis. 



The apseudopodiospores however, at least the majority whose 

 development was watched, were not gametes. 



The smallest of the young Amcebce (as we shall call them) those 

 which have just been separated from the parent body are about 

 3 to 5 microns in diameter and are extremely sluggish. The 

 body is sub-globular and changes its outline but little during 

 the very slow movement. No pseudopodia are developed. The 

 protoplasm is clear, and contains a few small, angular, trans- 

 parent granules. No contractile vacuole could be seen, nor 

 where the creatures observed to feed (Fig. 10). 



With growth comes an increase in activity and a progressively 

 greater irregularity of the body outline (Fig. n), until at length 

 true lobate pseudopodia make their appearance (Fig. 12). The 

 number of granules within the body increases, food is taken by 

 engulfing, and the protoplasm assumes a grayish hue. This color 

 may be due both to the number of particles within the endoplasm 

 and to the augmentation of its volume. 



At the time of the appearance of the true pseudopodia the 

 body is unsymmetrical, but as growth proceeds are more or less 

 radiate arrangement of the pseudopodia takes place, at first not 

 well defined, but becoming more and more pronounced with the 

 increase in size (Fig. 13). 



The pseudopodia now become more extended, and tend to 

 develop more acuminate tips. With increasing length and sharp- 

 ness the pseudopods seem to become more rigid, and spine like, 

 and the granules migrate from them into the more globular 

 central mass of the body, leaving them clear (Fig. 14). 



During the time when the young Amcebce are passing from 

 the apseudopodia stage to the radiosa stage they confusingly 

 resemble, if indeed they are not exactly similar to the species 



