BIBLIOGRAPHY 



Clemens, W. A. 1922. Hydra in Lake Erie. Science, Vol. 



55, No. 1426: 445. 

 Gudger, E. W. 1927. Hydras as Enemies of Young Fishes. 



Nat. Hist., Vol. 27: 270-274. 

 Hickson, S. J. 1925. Hydra and the Tadpoles. Nature, 



Vol. 115: 802. 

 Scourfield, D. J. 1904. Hydra and the Surface-Film of 



Water. Jour. Quekett Micr. Club, Nov. 1904. 

 Welsh, P. S., and Loomis, H. A. 1924. A Limnological 



Study of Hydra oligactis in Douglas Lake, Mich. Trans. 



Amer. Micr. Soc, Vol. 43: 203-235. 



CHAPTER Vni 



FREE-LIVING FLATWORMS 



General References: Ward and Whipple, 191 8; Chap. 12, 

 Stringer, C. E., Free-living Flatworms; Pratt, 1923. 



Bardeen, C. R. 1901. On the Physiology of the Planaria 

 maculata with Especial Reference to the Phenomena of 

 Regeneration. Amer. Jour. Phys., Vol. 5: 1-53. 



Carpenter, K. 1928. On the Tropisms of Some Freshwater 

 Planarians. Brit. Jour. Exp. Biol, Vol. 5, No. 3: 196- 

 203. 



Pearl, R. 1902. The Movements and Reactions of Fresh- 

 water Planarians. Quart. Jour. Micr. Sci., Vol. 46: 509- 



714- 

 Walter, H. E. 1907. The Reactions of Planarians to Light. 



Jour. Exp. Zool., Vol. 5: 35-162. 



CHAPTER IX 



WHEEL ANIMALCULES (Rotifera) 



General References: Needham and Needham, 1927; Ward 

 and Whipple, 19 18, Chap. 17, Jennings, H. S., Wheel, 

 • Animalcules. 

 Harring, H. K. 1913. Synopsis of the Rotatoria. U. S. 

 Nat. Mus., Bull. No. 81. 



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