CHILOMONAS PARAMCECIUM EHRENBERG. 219 



closely packed within the cytoplasm (Figs. I and 5). As the 

 paramylum granules become reduced .in size the chromatic bodies 

 become more frequent and lie within the enlarged masses of 

 cytoplasm that fill the interstices between the paramylum grains 

 (Figs. 2 and 3). Finally the granules of chromatic material 

 are largest, most numerous and most widely distributed when 

 the paramylum grains have been reduced to small, widely 

 separated spheroids (Figs. 4 and 6). 



These chromatic bodies, moreover, arise in the cytoplasmic 

 interstices between the paramylum grains. They lie closely 

 applied to the paramylum elements rather than to the nucleus. 

 Their contact with the nucleus seems to be purely incidental. 

 They appear rather to be bodies related to the changes involved 

 in the assimilation of the paraymlum grains. Their origin, then, 

 we consider to be cytoplasmic and not nuclear. These chromatic 

 granules we take to represent by-products or intermediate phases 

 of the assimilation of paramylum and are not idiochromidia. 



CONCLUSIONS. 



1. There is a well-defined nucleus with a definite nuclear 

 membrane in Ckilonwnas paramcecium . 



2. The chromatic bodies, that are found within the cytoplasm, 

 are related to the formation and disposal of paramylum and 

 must not be considered to be idiochromidia, for they are cyto- 

 plasmic and not nuclear in origin. 



LITERATURE. 

 Belar, Karl. 



'16 Protozoenstudien. II. Arch, fur Protistenkunde, Bd. 36, Heft 3. 

 Calkins, G. N. 



'99 Biological Lectures. Woods Holl, 1899. 



'01 The Protozoa. The Macmillan Co., New York. 



'09 Protozoology. Lea and Febiger, New York. 

 Eyferth, B. 



'oo Einfachste Lebensformen des Tier- und Pflanzenreiches. G. Goeritz. 

 Braunschweig. 



Jennings, H. S. 



'06 Behavior of the Lower Organisms. Columbia Press, New York. 



Kellicott, W. E. 



'13 Textbook of General Embryology. H. Holt and Co., New York. 

 Pascher, A. 



'13 Die Siisswasser Fauna Deutschlands, etc. Heft 2, Flagellatae II. G. 

 Fischer. Jena. 



