STUDIES ON EUGLENAMORPHA HEGNERI. 153 



The form of the body of the green variety is well illustrated in 

 Figs, i, 7, 8, and 9. It is more nearly cylindrical or cigar-shaped 

 as contrasted with the conical form of pellucida (Figs. 12 to 16). 

 In side view, the anterior end often appears obliquely truncated 

 with a notch which marks the location of the " mouth." There is 

 some variation in the posterior end and conditions as shown in 

 Fig. 20 are occasionally met with. The conical form of pellucida 

 is very constant in combination with the other characters of this 

 variety. 



The surface striae of the typical green individuals are fine, nu- 

 merous, and take a sharply spiral course passing from the left over 

 to the right as shown in Fig. 7. Occasionally they may be parallel 

 to the long axis (Fig. 8) or even pass spirally from right to left 

 (Fig. 9). In contrast the striae of the pellucid variety usually pass 

 spirally from right to left (Figs. 21, 28, 33) or are parallel to the 

 long axis (Figs. 12 to 16). They may, however, occasionally show 

 the reverse spiral condition typical of the green variety. There is 

 considerable variation in the appearance of these striae in the pel- 

 lucid variety, with evidence of their gradual disintegration. They 

 are frequently less numerous (Figs. 12, 16, and 33) and often 

 between these few there are fainter ones (Fig. 13). In other cases 

 the striae appear to be breaking up (Fig. 15) and they may not 

 show at all. These various conditions indicate that with the trans- 

 formation of the green variety into the colorless one the striae be- 

 come reversed in position and may gradually disintegrate, a set of 

 alternate striae disappearing first. This latter feature is the reverse 

 of the process of adding new striae after division in euglenoids, 

 when new ones are interpolated between those carried over from 

 the parent. 



The chloroplasts of the green variety are typically rounded disks 

 placed peripherally for the most part, but close enough together to 

 give the impression of a continuous green color. In some of the 

 cultures the chlorophyll became unevenly distributed, often disap- 

 pearing from one end or the other. In a few individuals it disap- 

 peared altogether in the cultures. Deeper in the protoplasm are 

 the smooth, refractive oval granules which appear to be paramylon 

 bodies. Usually from two to three microns long by one and one- 

 half to two microns wide and numbering from a dozen to three 



