214 PROTOZOOLOGY 



Beers, C. D.: (1926) The life-cycle in the ciliate Didinium nasutum 

 with reference to encystment. J. Morphol., 42:1. 



(1927) Factors involved in encystment in the ciliate Didin- 

 ium nasvtum. J. Morphol. Physiol., 43:499. 



(1928) Rhythms in Infusoria with special reference to Didin- 

 ium nasutum. J. Exper. Zool., 51:485. 



(1930) On the possibility of indefinite reproduction in the 



ciliate, etc. Am. Nat., 63:125. 



(1931) Some effects of conjugation in the ciliate Didinium 



nasutum. J. Exper. Zool., 58:455. 



(1935) Structural changes during encystment and excyst- 



ment in the ciliate Didinium nasutum. Arch. Protist., 84:133. 



(1937) The viability of 10-year old Didinium cysts. Am. 



Nat., 71:521. 



(1945) Some factors affecting excystment in the ciliate Til- 

 Una magna. Physiol. Zool., 18:82. 



(1945a) The excystment process in the ciliate Didinium 



nasutum. J. El. Mitchell Sc. Soc, 61 : 264. 

 (1946) History of the nuclei of Tillina magna during division 



and encystment. J. Morphol., 78:181. 

 (1946a) The excystment in Didinium nasutum with special 



reference to the role of bacteria. J. Exper. Zool., 103:201. 

 — (1946b) Tillina magna: micronuclear number, etc. Biol. 



Bull., 91:256. 

 (1947) The relation of density of population to encystment 



in Didinium nasutum. J. El. Mitchell Sc. Soc, 63:141. 

 Belar, K. : (1921) Untersuchungen ueber Thecamoeben der 



Chlamydophrys-Gruppe. Arch. Protist., 43:287. 



(1923) Untersuchungen an Actinophrys sol. I. Ibid., 46: 1. 



(1924) II. Ibid., 48:371. 



(1926) Der Formwechsel der Protistenkerne. Ergebn. u. 



Fortsch. Zool., 6:235. 

 Bodine, J. H.: (1923) Excystation of Colpoda cucullus. J. Exper. 



Zool., 37:115. 

 Boell, E. J. and Woodruff, L. L.: (1941) Respiratory metabolism 



of mating types in Paramecium calkinsi. J. Exper. Zool., 87:385. 

 Brachet, J.: (1950) Un etude cytochimique des fragments nuclees 



et enuclees d'amibes. Experientia, 6:294. 

 Buddenbrock. W. v. : (1922) Ueber eine neue Strombidium-Art aus 



Heligoland. Arch. Protist., 45:129. 

 Butschli, O.: (1876) Studien liber die ersten Entwicklungsvorgange 



der Eizelle, die Zelltheilung und die Conjugation der Infusorien. 



Abh. Senk. Nat. Ges. Frankf., 10:1. 

 Btjrnside, L. H.: (1929) Relation of body size to nuclear size in 



Stentor coeruleus. J. Exper. Zool., 54:473. 

 Burt, R. L., Kidder, G. W. and Claff, C. L.: (1941) Nuclear re- 

 organization in the family Colpodidae. J. Morphol., 69:537. 

 Calkins, G. N.: (1919) Uroleptus mobilis. II. J. Exper. Zool., 29: 



121. 



- (1933) The biology of the Protozoa. 2nd ed. Philadelphia. 



