"NATDRAL HISTORY REVIEW." 



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On the British Marine Testaceous Mollusca. By W. Clark. 



On the dying properties of Lichens. By L. Lindsay, M D. 



Shells and their Inhabitants. By H. and A. Adams. Parts 18, 19, and 20. 



Reviews of Lovell Reeve's Monograph of the Helices, and of Zetterstedt's work on Diptera, 

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We have found it necessary to enlarge this number of the " REVIEW " by an additional 

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 Plate, illustrating Mr. Haliday's description of new Diptera, together with Mr. Andrews's 

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