172 PROTOZOOLOGY 



In addition to these restorative regenerations, there are physio- 

 logical regenerations in which as in the case of asexual and sexual re- 

 production, various organellae such as cilia, flagella, cytostome, 

 contractile vacuoles, etc., are completely regenerated due to certain 

 internal conditions. 



References 



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Belar, K. 1924 Untersuchungen an Actinophrijs sol Ehrenberg. II. 

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1926 Der Formwechsel der Protistenkerne. Ergebn. u. 



Fortsch. Zool., Vol. 6. 



BoELL, E. J. and L. L. Woodruff 1941 Respiratory metabolism of 

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BuRNSiDE, L. H. 1929 Relation of body size to nuclear size in 

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Calkins, G. N. 1919 Uroleptus mohilis Engelm. II. Renewal of vi- 

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1933 The biology of the Protozoa. Second edition. Philadel- 

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and R. C. Bowling 1926 Gametic meiosis in Monocystis. 



Biol. Bull, Vol. 51. 



and F. M. Summers, editors. 1941 Protozoa in biological re- 

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Chalkley, H. W. and G. E. Daniel. 1933 The relation between 

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Chen, T. T. 1936 Observations on mitosis in opalinids. I. Proc. 

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Clark, A. M. 1942 Some effects of removing the nucleus from 

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1943 Some physiological functions of the nucleus in Amoeba, 



investigated by micrurgical methods. Ibid., Vol. 21. 



Cleveland, L. R. 1938 Longitudinal and transverse division in 

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1938a Origin and development of the achromatic figure. 



Ibid. 



, S. R. Hall, E. P. Sanders and J. Collier 1934 The wood- 

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Dawson, J. A. 1919 An experimental study of an amicronucleate 

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DiLLER, W. F. 1936 Nuclear reorganization processes in Parame- 

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DoBELL, C. 1908 The structure and life history of Copromonas suh- 

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