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SMITH: TETRADESMUS, A NEW COENOBIC ALGA 
Grintzesco, J. Recherches expérimentales sur la morphologie et 
la physiologie de Scenedesmus acutus Meyen. Bull. Herb. Boiss. 
Ly 34.297: 1902: 
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467. 1899. 
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Roth. Bot. Zeit. 49: 789. 1891. 
. [Knop]. Reference in Kiister, Kultur der Mikroorganismen. 
Leipzig, 1907. 
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C. moniliferum. Bot. Gaz. 49: 241. 1910. 
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Embedding microscopic algae. Univ. Calif. Publ. Bot. 2: 85. 
1904. 
Schmidle, W. Beitrage zur Kenntniss der Planktonalgen. Ber. 
Deut. Bot. Gesell. 18: 144. 1900. 
. Senn, G. Ueber einige koloniebildende einzellige Algen. Bot. 
Zeit. 57: 39. 1899. 
. Timberlake, H.G. Starch-formation in Hydrodictyon utriculatum. 
Ann. Bot. 15: 619. 1901. 
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of Hydrodictyon. Trans. Wisconsin Acad. Sci. Arts and Lett. 
13: 486. 1902. 
. West, G. S. A treatise on the British freshwater algae. Cam- 
bridge, 1904. 
. Wildeman, E. de: Etudes sur ]’attache des cloisons cellulaires. 
Mém. cour. et mém. des sav. étrang., Acad. Roy. Sci. Lett. et 
Beaux-arts de Belg. 53: 1. 1893. 
- Wille, N. Conjugatae und Chlorophyceae. Engler und Prantl, 
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N. Y.. 1906. 
Explanation of plate 1 
All figures, with the exception of Fic. 3, are of Tetradesmus wisconsinensis- 
They were drawn with the aid of the Abbe camera lucida, the drawing being at the 
level of the base of the microscope, and with the Leitz objective 1/16 and ocular 4- 
The magnification is about 2,200 diameters. 
Fic. 1. Longitudinal section of colon 
Fic. 2. Surface view of colony, showing arrangement of cells. 
Fic. 3. Colony of Scenedesmus acutus Meyen grown under the same cultural 
conditions as the colonies of Tetradesmus shown in FIG. I and 2. 
