DATES OF PUBLICATION. XI 



8. Receipt acknowledged by the Boston Society of Natural His- 



tory, June 30, 1851. 



9. Ditto, December 31, 1851. 

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11. 



12. Receipt acknowledged by the Smithsonian Institution, Febru- 

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3. " August 20, 1852. 

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tory, December 31, 1852. 



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ary 7, 1853. 



7. Ditto, April 3, 1853. 



8. " June 21, 1853. 



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Vol. VII, No. 1. Receipt acknowledged by the American Philosophical Societv, 

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