812 PROTOZOOLOGY 



cordiformis. Bol. Real Soc. Espan. Hist. Nat., 46:219. 



Geiman, Q. M. and Wichterman, R. : (1937) Intestinal Protozoa 

 from Galapagos tortoises. J. Morphol., 23:331. 



Hamilton, J. M.: (1950) A f olliculinid from northwestern Iowa. Sci- 

 ence, 111:288. 



(1952) Studies on loricate Ciliophora. Proc. Iowa Acad. Sc, 



58:469. 



Hegner, R. W. : (1934) Specificity in the genus Balantidium based 

 on size and shape, etc. Am. J. Hyg., 19:38. 



(1940) Nyctotherus beltrani, etc. J. Parasitol., 26:315. 



Higgins, Helen T.: (1929) Variation in the Nyctotherus found in 



frog and toad tadpoles and adults. Tr. Am. Micr. Soc, 48: 141. 

 Jameson, A. P.: (1927) The behavior of Balantidium coli in cultures. 



Parasitology, 19:411. 

 Kahl, A.: (1932) Urtiere oder Protozoa. Dahl's Die Tierwelt 



Deutschlands, etc. Part 15. 

 Kidder, G. W.: (1937) The intestinal Protozoa of the wood-feeding 



roach Panesthia. Parasitology, 29:163. 

 • (1938) Nuclear reorganization without cell division in Para- 



clevelandia simplex, etc. Arch. Protist., 91:69. 

 Kirby, H. Jr.: (1934) Some ciliates from salt marshes in California. 



Ibid., 82:114. 

 Kudo, R. R.: (1936) Studies on Nyctotherus ovalis, with special ref- 

 erence to its nuclear structure. Ibid., 87: 10. 

 and Meglitsch, P. A.: (1938) On Balantidium praenuclea- 



tum, etc. Ibid., 91:111. 

 Lamy, L. and Roux, H.: (1950) Remarques morphologiques, bio- 



logiques et specifiques sur les Balantidium de culture. Bull. Soc. 



Path. Exot., 43:422. 

 Levine, N. D. : (1940) The effect of food intake upon the dimensions 



of Balantidium from swine in culture. Am. J. Hyg., 32:81. 

 Lucas, Miriam S.: (1934) Ciliates from Bermuda sea urchins. I. 



J. Roy. Micr. Soc, 54:79. 

 McDonald, J. D. : (1922) On Balantidium coli and B. suis (sp. nov.). 



Univ. California Publ. Zool., 20:243. 

 Moore, Imogene: (1934) Morphology of the contractile vacuole and 



cloacal region of Blepharisma undulans. J. Exper. Zool., 69:59. 

 Neiva, A., da Cunha, A. M. and Travassos, L.: (1914) Para- 



sitologische Beitrage. Mem. Inst. Oswaldo Cruz, 6:180. 

 Nelson, E. C. : (1934) Observations and experiments on conjugation 



of the Balantidium from the chimpanzee. Am. J. Hyg., 20: 106. 

 Nie, D.: (1950) Morphology and taxonomy of the intestinal Pro- 

 tozoa of the guinea-pig, Cavia porcella. J. Morphol., 86:381. 

 Noland, L. E. : (1927) Conjugation in the ciliate, Metopus sigmoides. 



J. Morphol. Physiol., 44:341. 

 Peschkowsky, Ludmilla: (1927) Skelettgebilde bei Infusorien. 



Arch. Protist., 56:31. 

 Poljansky, G.: (1934) Geschlechtsprozesse bei Bursaria truncatella. 



Ibid., 81:420. 

 Powers, P. B. A.: (1936) Studies on the ciliates of sea urchins, etc. 



Papers Tortugas Lab., 29:293. 

 Sahrhage, H.: (1916) Ueber die Organisation und die Teilungsvor- 



