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1 Department of Zoology, University of Kansas, Lawrence Kansas
1. Serological comparisons were made with precipitins of proteins from molluscan species representative of the four Classes Amphineura, Gastropoda, Cephalopoda and Pelecypoda.
2. Interclass reactions were approximately at the limit of the sensitivity of the turbidimetric method which was employed.
3. Knight's proposal to include the amphineurans in the Class Gastropoda is not supported by the serological data. The analysis and integration of the serological data already in the literature, with the data in this work, provide additional evidence that the four groups should be retained as distinct Classes.
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