1-41. 1916a. Oocystis and Eremosphaera. Ibid., 41: 107-147; Pis. 7-9; Figs. 

 1-28. 1917. Australian freshwater phytoplankton. Ibid., 41: 823-852; Pis. 

 56-59. 1918. New and rare freshwater algae. Ibid., 43: 497-543; Pis. 54-58; 

 Figs. 1-11. 1920. Peridineae of New South Wales. Ibid., 44(1919): 793-818; 

 Pis. 41-43; Figs. 1-18. 1921. Australian freshwater flagellates. Ibid., 46: 

 99-146; Pis. 1-9; Figs. 1,2. 1923. Notes on freshwater algae. Ibid., 48: 

 206-228; Figs. 1-30. 

 PocHMAN, A. 1942. Synopsis der Gattung Phacus. Arch. f. Protist, 95 (No. 2): 



81-252; Figs. 1-170. 

 PococK, Mary A. 1933. Volvox and associated algae from Kimberly. Ann. S. 

 African Mus., 16: 473-521. 1933a. Volvox in South Africa. Ibid., 16: 

 523-646. 

 PoLjANSKY, G. I. 1923. De nova Euglenarum specie. Not. Syst. Inst. Crypt. 



Horti Bot. Petropol., 1(1922): 177-183. 

 Pollock, J. E. 1942.* Blue-green algae as agents in the deposition of marl 



in Michigan lakes. Ann. Rep. Mich. Acad. Sci., 20: 247-260; Pis. 16. 17. 

 PoTZGER, J. E. 1942.* Study on the rooted aquatic vegetation of Weber Lake, 

 Vilas County, Wisconsin. Trans. Wis. Acad. Sci., Arts, and Letters, 34: 

 149-166; Figs. 1-3. 

 PouLTON, E. 1926.t Etude sur les Heterokontees. Thesis, Univ. Geneve, Class. 



Sci. Ser. 10, Fasc. 11: 96 pp.; Figs. 1-13. 

 Powers, E. B., Shields, A. R., and Hickman, M. E. 1939. The mortality of 



fishes in Norris Lake. Jour. Tenn. Acad. Sci., 14: 239-260. 

 Powers, J. H. 1905. New forms of Volvox. Trans. Amer. Microsc. Soc, 27: 



123-149; Pis. 11-14. 

 Prescott, G. W. 1927. The motile algae of Iowa. Univ. Iowa Studies Nat. 

 Hist., 12: 1-40; Pis. 1-10. 1931. Iowa algae. Ibid., 13: 1-235; Pis. 1-39. 

 1931a. Iowa lake survey. A report to the Iowa State Fish and Game Com- 

 mission. Mimeographed. 1936. Notes on the algae of Gatun Lake, Panama 

 Canal. Trans. Amer. Microsc. Soc, 55: 501-509; Pis. LXIV-LXV. 1937.* 

 Preliminary notes on the desmids of Isle Royale, Michigan. Pap. Mich. Acad. 

 Sci., Arts, and Letters, 22: 201-212; PI. 19. 1938.* A new species and a 

 new variety of the algal genus Vaucheria De Candolle with notes on the 

 genus. Trans. Amer. Microsc. Soc, 57: 1-10; Pis. 1,2. 1938a. Objectionable 

 algae and their control in lakes and reservoirs. Municipal Rev., l(No. 2/3) 

 [reprint; pages not numbered]. 1938b.* Further notes on the desmids of 

 Isle Royale, Michigan. The genus Cosmarium. Pap. Mich. Acad. Sci., Arts, 

 and Letters, 23: 203-214. 1939.* Some relationships of phytoplankton to 

 limnology and aquatic biology. In Problems of lake biology. Amer. Assoc. 

 Adv. Sci., Publ. No. 10: 65-78; Figs. 2-4. 1940.* Desmids of Isle Royale, 

 Michigan. The genera Staurastrurn, Micrasterias, Xanthidium, and Euastrum, 

 with a note on Spinoclosterium. Pap. Mich. Acad. Sci., Arts, and Letters, 

 25(1939): 89-100. 1941.* A concluding list of desmids from Isle Royale, 

 Michigan. Ibid., 26(1940): 23-29; Pis. 1,2. 1942. The fresh-water algae 

 of southern United States. II. Trans. Amer. Microsc Soc, 61: 109-119. 1944.* 

 New species and varieties of Wisconsin algae. Farlowia, 1: 347-385. 1948. 

 Objectionable algae with reference to the kiUing of fish and other animals. 

 Hydrobiologia, l(No. 1): 1-13. 

 Prescott, G." W., and Croasdale, Hannah T. 1937. New or noteworthy 

 fresh water algae of Massachusetts. Trans. Amer. Microsc. Soc, 56: 269- 

 282; Pis. 1-3. 1942. The algae of New England. II. Amer. Midi. Nat., 27: 

 662-676; Pis. 1-5. 

 Prescott, G. W., and Magnotta, Angelina. 1935.* Notes on Michigan des- 



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