162 D. H. WENRICH. 



and certain observations on other flagellates and Sporosoa supports 

 the theory of the origin of the Sporozoa from Euglenoids. In a 

 footnote to this paper he says that Brumpt had shown him prepara- 

 tions from tadpoles in which there were " hundreds and hundreds 

 of Eugleniens." While it is possible for tadpoles to ingest hun- 

 dreds of Euglena at one time, the writer's experience is that Eu- 

 glenamorpha alone occurs in hundreds, so that it is possible that 

 both Alexeieff and Brumpt had observed Euglenamorpha. 



Haswell ('92, '07) and Beauchamp ('n) report the finding of 

 Euglena-like flagellates in the tissues of different rhabdocrel worms, 

 but in each case there was but a single flagellum. Beauchamp's 

 fairly complete description of his Astasia captiva reveals a number 

 of points of similarity between it and Euglenamorpha hegneri 

 (type). They are similar in size, shape, paramylon granules, and 

 surface striations. They differ, however, in the absence of color 

 and the presence of but one flagellum in Astasia captiva, which 

 also has a nuclear structure somewhat different from that of E. 

 hegneri. 



Since ordinary Euglenoids pass through tadpoles to resume ac- 

 tivity upon emerging, the assumption of regular activity within the 

 host would be an easy transition. One naturally wonders if there 

 is a three-flagellated Euglenoid which has not assumed the entozoic 

 habit. None has been found described in the literature, and none 

 has been observed in the water of the pond from which the tad- 

 poles were obtained. 



Since Zumstein ('oo) and Ternitz ('12) have found that Eu- 

 glena gracilis will lose its chlorophyll and become colorless when 

 supplied with rich nourishment, it is not so surprising that Eu- 

 glenamorpha should lose its chlorophyll and become colorless in 

 the rectum of the tadpoles where it presumably is surrounded by 

 abundant food. Zumstein and Ternitz do not record any morpho- 

 logical changes, other than in the cytoplasmic bodies, accompanying 

 the loss of color in Euglena gracilis. It is, therefore, remarkable 

 that E. hcgncri should exhibit so many structural changes when it 

 loses its color. The differences in shape of body, number of 

 flagella, structure of the nucleus, in surface striae and in reservoir, 

 in addition to the difference in color, would probably justify the 

 formation of a different genus if the intermediate states had not 



