REFERENCES 201 



Watson, M. R. and Silvester, N. R., (1959). Studies of invertebrate 



collagen preparations. Biochein. jf. 71, 578-584. 

 Watson, M. R. and Smith, R. H. (1956). The chemical composition of 



earthworm cuticle. Biochevi. J. 64, 10 P. 

 Welsh, J. H. and Moorhead, M. (1960). The quantitative distribution of 



5-hydroxytryptamine in the invertebrates, especially in their nervous 



systems. J^. Neurochem. 6, 146-169. 

 Wherry, R. J. and Sanders, J. M. (1941). Modifications of a tropism 



in Liimbriciis terrestris. Trans. Illin. Acad. Set. 34, 237-287. 

 WiLLEM, V. and Minne, A. (1900). Recherches sur I'excretion chez 



quelques annelides. Mem. Acad. Roy. Belg. 58, 1-73. 

 Wilson, D. M. (1961). The connections between the lateral giant fibers 



of earthworms. Comp. Biochem. Physiol. 4, 274-284. 

 WiTTiCH, W. (1953). Untersuchungen uber den Verlauf der Streuzer- 



setzung auf einem Boden mit starker Regenwurmtatigkeit. Schriften- 



reihe forstl. Fak. Univ. Gottingen, 9, 5-33. 

 Wolf, A. V. (1938). Studies on the behaviour of L. terrestris and evidence 



for a dehydration tropism. Ecology, 19, 233-242. 

 Wolf, A. V. (1940). Paths of water exchange in the earthworm. Physiol. 



Zool. 13, 294-308. 

 Wolf, A. V. (1941). Survival time of the earthworm as affected by raised 



temperatures. J. cell. comp. Physiol. 18, 275-278. 

 Wu, K. S. (1939a). On the physiology and pharmacology of the earthworm 



gut. J. exp. Biol. 16, 184-197. ' 

 Wu, K. S. (1939b). The action of drugs, especially acetylcholine, on the 



annelid body wall {Lumbricus, Arenicola). jf. exp. Biol. 16, 251-257. 

 Yerkes, R. M. (1912a). Habit and its relations to the nervous system in the 



earthworm. Proc. Soc. exp. Biol., N.Y., 10, 16-18. 

 Yerkes, R. M. (1912b). The intelligence of earthworms, jf. Anim. 



Behav. 2, 332-352. 

 Zhinkin, L. (1936). The influence of the nervous system on the regenera- 

 tion of Rhynchelmis limosella. J. exp. Zool. 73, 43-65. 

 Zicsi, A. (1958). Freilandsuntersuchungen zur Kenntnis der Empfind- 



lichkeit einiger Lumbricidenarten gegen Trockenperioden. Acta. 



Zool. Acad. Scient. Hung. 3, 369-383. 



