640 Annals of the South African Museum. 



KNOCKE, F., 1925. " Abhangigk. der Entw. des V. aureus von ausseren Bed.," 



Bot. Archiv, vol. vi, p. 405. 

 *KUSCHAKEWITSCH, S., 1922. " Zur Kenntn. d. Entwickl.-gesch. von Volvox," 



Bull, de 1'Acad. d. Sci. de 1'Oukraine, vol. i, p. 32. 

 KUSCHAKEWITSCH, S., 1931. " Zur Kenntn. d. Entwickl.-gesch. von Volvox," 



Archiv f. Protistenk., vol. Ixxiii, p. 324. 

 LA COUR, L., 1931. " Improvements in Everyday Technique in Plant Cytology," 



Journ. Roy. Micr. Soc., vol. li, p. 119. 

 LANDER, C., 1929. " Oogenesis and Fert. in Volvox," Bot. Gaz., vol. Ixxxvii, 



p. 431. 

 *LEEUWENHOEK, A. V., 1719. Epis. ad. Soc. reg. anglicam s. cont. mir. 



Arcanorum Nat. Opera omnia, vol. iii. 



MAINX, F., 1929. " Uber die Geschlechtvert. bei V. aureus,'" Archiv f. Proti- 

 stenk., Jena, vol. Ixvii, p. 205. 

 *MAST, S. 0., 1907. " Light Reactions in Lower Organisms. II. Volvox," Journ. 



Comp. Neur. and Path., vol. xvii, p. 99. 

 MAST, S. 0., 1923. " Eyes in Volvox and their Functions," Anat. Record, vol. 



xxiv, p. 397. 

 MAST, S. 0., 1927-28. " Structure and Function of Eyespot in Unicellular and 



Columnar Organisms," Archiv f. Protistenk, vol. Ix, part ii, p. 197. 

 MERTON, H., 1908. " Pleodorina," Zeitsch. f. wiss. Zool., vol. xc, p. 445. 

 MEYER, A., 1895. " Uber der Bau v. V. aureus u. V. globator," Bot. Zentralbl., 



vol. Ixiii, p. 225. 

 *MEYER, A., 1896. " Die Plasmsverb. u. Membr. v. V. globator, aureus, u. tertius," 



Bot. Zeitung, vol. liv, p. 187. 

 MOTTIER, D. M., 1916. " Chloroform as a Paraffin Solvent in the Embedding 



Process," Bot. Gaz., vol. Ixi, p. 251. 



OLTMANNS, FR., 1917." Uber Phototaxis," Zeitsch. f. Bot., vol. ix, p. 257. 

 OLTMANNS, FR., 1922. Morph. u. Biol. der Algen, Jena, II Aufl., vol. i, p. 201. 

 OVERTON, E., 1889. " Beitr. z. Kenntn. d. Gatt. Volvox," Bot. Zentralbl., 



vol. xxxix, p. 243. 

 PAGAN, A., 1887. " On a New Arrangement of Growing Slide," Journ. Quek. 



Micr. Club, vol. iii, p. 81. 

 PASCHER, A., 1927. Uber Sussw.-fl. Deutschlands, Osterreichs u. der Schweitz, 



Heft iv. 

 POCOCK, M. A., 1933. " Volvox and Associated Algae from Kimberley," Ann. 



S. Afr. Mus., vol. xvi, p. 473. 

 *PowERS, J. H., 1907. " New Forms of Volvox," Trans. Am. Micr. Soc., vol. xxvii, 



p. 28. 

 POWERS, J. H., 1908. " Further Studies in Volvox," Trans. Am. Micr. Soc., 



vol. xxviii, p. 141. 

 *PRINGSHEIM, N., 1869. " Uber Paarung v. Schwarmsporen, usw.," Monatsber. 



d. Kgl. Akad. d. Wiss. Berlin, Ges. Abh. 1. 

 PRINTZ, H., 1927. Volvocaceae in Engler's Nat. Pfl.-fam., 2nd ed., vol. iii, 



p. 59. 

 RICH, F., and POCOCK, M. A. "Observations on the Genus Volvox in Africa," 



Ann. S. Afr. Mus., vol. xvi, p. 427. 

 ROUSSELET, C. F., 1906." The Rotifers of South Africa," Journ. Roy. Micr. 



Soc., p. 363. 



