LEE BARKER WALTON 95 



nutrient material in the small closed lens paper aquarium. 



While the synthesis of "paramylon," a term first sug- 

 gested by Gottleib, (1851) because of the similarity in 

 chemical composition to amylon (starch), normally oc- 

 curs in connection with the chloroleucites present in the 

 Euglenidae, the question as to its possible free formation 

 as an assimilation product of the protoplasm has long been 

 one of interest and one concerning which no definite 

 statement may up to the present time be made. The mode 

 of formation of the anterior paramylon granule in 

 Euglena oxyuris is extremely suggestive, however, that the 

 result is due to the activities of the protoplasm quite, in- 

 dependently of the numerous small chloroleucites present. 

 Distributed irregularly as they are throughout the cell 

 body, it seems difficult to believe that their products 

 should unite to make a structure so definite in form and 

 position. 



The time taken for the division of the individual was 

 6^ hours, with the assumption that the condition as 

 figured in ''B" had occupied only a brief period. Keuten 

 (1895) notes the time of division in Euglena virdis as 3-4 

 hours. There are apparently no notes concerning the 

 time necessary for division among other related forms, 

 although Doflein (1911) gives a comparative table for 

 various species of Protozoa. The factor is undoubtedly 

 a variable one and largely dependent on the surrounding 

 conditions particularly temperature and nourishment. 



BIBLIOGRAPHY 



BuTSCHLi, O., 1906. Beitrage zur Kenntnis des Paramylon. Archiv fur Protisten- 

 kunde, p. 197, 1 Taf. 



Dangeard, p. a., 1902. Recherches sur les Eugleniens. Botaniste, ser. 8. 



Doflein, F., 1911. Lehrbuch der Protozoenkunde. 



Gottleib, J., 1851. Ueber eine neue mit Starkemehl isomere Substanz. Ann. d. 

 Chemie u. Pharmacie. Bd. 75, p. 51. 



Keuten, L., 1895. Die Kernteilung von Euglena viridis. Zeit. wiss. Zool. V. 60, 

 p. 215. 



Klebs, G., 1881. Organisation einiger Flagellatengruppen u. ihre Beziehungen zu 

 Algen u. Infusiorien. Untersuch. bot. Inst. Tubingen, Bd. 1. 



ScHMiTZ, P., 18 83. Die Chromatophoren der Algen, Bonn. 



Schmitz, F., 1884. Beitrage zur Kenntnis der Chromatophoren. Pring. Jahrb. 

 Bd. XV, p. 1. 



Oltmanns, F., 1905. Morphologic und Biologic der Algen, Bd. 2, p. 151. 



