Feb., 1915.] Paramylon in Euglena Oxyuris Schmarda. 
45 1 
granule. It was, however, not until the succeeding day at 9:00 
A. M. (Fig. 1, G), approximately 40 hours from the time of the 
complete division that an irregular, but distinct granule became 
visible. This gradually increased in size, but had not attained 
its full development at the end of the day, when the observations 
were brought to a close. The other twin individual had in the 
meantime disappeared. 
There are two factors, however, which may have been instru¬ 
mental in delaying the formation of the anterior granule, the 
lowering of the room temperature nearly to freezing at night, and 
the possible lack of the necessary nutrient material in the small 
closed lens paper aquarium. 
While the synthesis of “paramylon,” a term first suggested by 
Gottleib, (1851) because of the similarity in chemical composition 
to amylon (starch), normally occurs in connection with the 
chloroleucites present in the Euglenidae, the question as to its 
possible free formation as an assimilation product of the proto¬ 
plasm 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 independently 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 63d; 
hours, with the assumption that the condition as figured in “B” 
had occupied only a brief period. Keuten (1S95) 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. 
Bctschli, O., 1906. Beitrage zur Kenntnis des Paramylon. Archiv fur 
Protistenkunde, p. 197, 1 Taf. 
Daxgeard, 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. Pharmaeie. 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 Bezie- 
hungen zu Algen u. Infusiorien. Untersuch. bot. Inst. Tubingen, Bd. 1. 
Schmitz, F., 1883. Die Chromatophoren der Algen, Bonn. 
Schmitz, F., 1884. Beitrage zur Kenntnis der Chromatophoren. Pring. 
Jahrb. Bd. XV, p. 1. 
Oltmanns, F., 1905. Morphologie und Biologie der Algen, Bd. 2, p. 151. ' 
Kenyon College, Gambier, Ohio, Dec. 24, 1914. 
