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Esper, E. J. Die Pflanzuiitliiere. (Zoophyta.) 3 pts. and suppl. 

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Gray, J. E. Catalogues of Echinida, Starfishes, Sea Pens 

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Greene, J. R. Manual of the Coelenterata. 8vo. London, 

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Haeckel, E. Contributions to Nat. Hist, of Hydromedusse. 

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Kolliker, A. Descriptions, Anatomical and Systematic, of the 

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