USEFUL WOKKS— (continued). 

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A History of the Spiders of Great Britain and Ireland. By John Blackwall, 

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Introduction to the Study of the Foraminifera. 



ByW. B. Caepentee, M.D., F.R.S., F.L.S., &c. ; assisted by W. K. Parses, 

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On the Germination, Development, and Fructification of 

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By Dr. Wilhelm Hofheistee. Translated by Feedeeick Cueeet, M.A., 

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British Nudibranchiate Mollusca. 



A Monograph of the (with coloured drawings of every species). 

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By Messrs. 



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British Hemiptera-Heteroptera. 



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Miscellaneous Botanical Works. 



By Robeet Brown, F.R.S., edited by J. J. Bennett, Esq., F.R.S. Vol. I. 8vo. 

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The Greenland Whale. 



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On Pterylography. 



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