Herb. Boiss., 3: 328-333. 1897. Encore le Pleurococcus nimbatus de Wild. 



Ibid., 5: 532. 

 DiESiNG, K. M. 1866. Revision der Prothelminthen. Abtheilung Mastigophoren 



Sitz. K. K. Akad. Wiss. Wein, Math.-Nat. Kl., 52(1865), Abt. 1: 287-401. 

 Dill, O. 1895. Die Gattung Chlamydomonas und ihre nachsten Verwandten. 



Pringsh. Jahrb. f. Wiss. Bot., 28: 323-358; PI. 5. 

 DiLLWYN, F. 1802. British conjugates. London . 

 DrwALD, Karl. 1989. Ein Beitrag zur Variabilitat und Systematik der Gattung 



Peridinium. Arch. f. Protist., 93: 121-148. 

 DoFLEiN, F. 1916. Lehrbuch der Protozoenkunde. IV. Auflage. Jena. 1921. 



Mitteilungen iiber Chrysomonadinen aus dem Schwarzwald. Zool. Anz., 53: 



153-173; Figs. 1-A. 1922. Untersucliungen iiber Chrysomonadinen. Arch. f. 



Protist., 44: 149-213. 1923. Untersuchungen iiber Chrysomonadinen. III. 



Arten von Chromulina und Ochromonas aus dem Badischen Schwarzwald 



und ihre Cystenbildung. Ibid., 46: 267-327; Pis. 15-21. Figs. A-E. 

 DoLLEY, John S. 1933.** Preliminary notes on the biology of the St. Joseph 



River. Amer. Midi. Nat., 14: 193-227. 

 DoMOGALLA, B. P. 1926." Treatment of algae and weeds in lakes at Madison, 



Wisconsin. Eng. News Record, Dec. 9, 1926: 950-954. 1935.* Eleven years 



of chemical treatment of the Madison lakes: its effect on fish and fish foods. 



Trans. Amer. Fish. Soc, 65: 115-120. 

 DoMOGALLA, B. P., and Fbed, E. B. 1926. Ammonia and nitrate studies of 



lakes near Madison, Wisconsin. Jour. Amer. Soc. Aeronomv, 18: 897-911. 

 DoROGOSTAJiSKY, V. 1905. Materiaux pour servir a I'algologie du lac Baikal et de 



son bassin. Bull. Soc. Imp. Nat. Moscou, 1904 (No. 2/3): 228-265. 

 Drezepolski, R. 1923. De Eugleninis se ipsis sustinentibus ex coUectione facta 



a Dr. J. Grochmalicki in Podlachi et Lithuania. Obd. z Rozpraw i wradomosci 



z Muzeum im Dzied, 7/8(1922): 1-19. 1925. Przycznek do znajomosci 



polskich Euglenin. (Supplement a la connaissance des Eugleniens de la 



Pologne.) "Kosmos," Jovu. Soc. .Polonaise Nar. "Kopernik," 50(Fasc. l.A): 



173-270; Pis. 1-6. 

 Drouet, F. 1937. The Brazihan Myxophyceae. I. Amer. Jour. Bot., 24: 598- 



608; Figs. 1-5. 1938. Ibid. II. Ibid., 25: 657-666. 1938a. The Oscillatoriaceae 



of southern Massachusetts. Rhodora, 40: 221-241, 255-273. 1939. Francis 



Wolle's filamentous Myxophyceae. Field Mus. Bot. Ser., 20: 17-64; Fig. 1. 



1939a. The Myxophyceae of Maryland. Ibid., 20: 3-14. 1942. Studies in 



Myxophyceae. I. Ibid., 20: 125-141. 1943. New species of Oscillatoriaceae. 



Amer. Midi. Nat., 29: 51-54. 

 Drouet, F., and Cohn, A. 1935. The morphology of Gonyostomum semen 



from Woods Hole, Massachusetts. Biol. Bull., 68: 422-439. 1937. Further 



observations on Gonyostomum semen. Bot. Gaz., 98: 617-618. 

 Drouet, F., and Daily, Wm. A. 1939. The planktonic freshwater species of 



Microcystis. Field Mus. Bot. Ser., 20: 67-83. 

 DujARDiN, M. F. 1841. Histoire naturelle des Zoophytes. Infusiores, compre- 



nant la physiologic et la classification de ces animaux et la maniere de les 



estudier a I'aide du microscope. In Suites a Bulfon. Paris. 

 DuTTON, H. J. 1941. The chromatographic adsorption of plant pigments as a 



limnological method. In A Symposium on Hydrobiology. Madison. 

 DuTTON, H. J., and Manning, W. M. 1941. Evidence for carotenoid-sensitized 



photosynthesis in the diatom Nitzschia Closterium. Amer. Jour. Bot., 28; 



516-526. 

 Eddy, Samuel. 1927.* The plankton of Lake Michigan. 111. Nat. Hist. Surv., 17: 



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