724 Comparative Animal Physiology 



199. Wells, G. P., Nahire 129:6<||r687 (1932). Color change, leeches. 



200. Wykes, U., /. Exper. Biol. 14:79-86 (1937). Measurement of chromatophore 

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201. Wyman, L. C, ;. Exper. Zool. 40:161-180 (1924). Color change in young 

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202. Young, J. Z., Quart. ]. Micr. Set. 75:571-624 (1933). Control of elasmobranch 

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203. Young, J. Z., /. Exper. Biol. 12:254-270 (1935). Pineal body in color change, 

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204. Zondek, B., and Krohn, J., Khn. Wchnsc/jr. 11:405-408(1932). Intermedin in 

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205. Zoond, a., and Eyre, J., Phil. Tr. Roy. Soc. Lond., B. 223:27-55 (1934). Con- 

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