A Treatise on Zoology . Edited by E. Ray Lankester. Part IV. The Platyhelmia, Mesozoa, and Nemertini . By W. Blaxland Benham, ID.Sc., M.A. London, Adam and Charles Black, Publishers; New York, Macmillan & Company. Pp. 204. 114 figs. in text. Price $5.25.
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