276 PROCEEDINGS OF THE AMERICAN ACADEMY 



Joseph Leidy, M. D. 



Description of some Annelida Abranchia. (Article III., Journal 

 of the Academy of Natural Sciences, Vol. II. N. S.) 



Special Anatomy of the Gasteropoda of the United States. By 

 J. Leidy, M. D. 8vo, Plates. 

 Samuel G. Morton, M. D. 



Letter to the Rev. John Bachman, D. D., on the Question of Hy- 

 bridity in Animals, considered in Reference to the Unity of the 

 Human Species. By S. G. Morton, M. D., &c. 8vo pamph. 

 Charleston, 1850. 



Additional Observations on Hybridity in Animals, and on some 

 Collateral Subjects. 8vo pamph. Charleston, 1850. 



Notes on Hybridity, designed as a Supplement to the Memoir on 

 that Subject. 8vo. Philadelphia, 1850. 



Ibid. Second Supplement. January, 1851. 

 Professor C. B. Adams. 



Contributions to Conchology. 

 J. W. Foster and J. D. Whitney. 



Report on the Geology of a Portion of the Lake Superior Land 

 District, in the State of Michigan. By J. W. Foster and J. D. Whit- 

 ney, U. S. Geologists. Part I. Copper Lands. 8vo. Washington, 

 1850. 

 C. T. Jackson, M. B. 



Report on the Geology of the Mineral Lands of the United States 

 in Michigan. By C. T. Jackson, M. D., U. S. Geologist. 8vo. 

 Washington, 1849, 

 Mrs. Binney. 



The Terrestrial Air-breathing Mollusks of the United States and 

 the adjacent Territories of North America. Described and illus- 

 trated by Amos Binney. Edited by Augustus A. Gould, M. D. 4to. 

 2 vols. Boston, 1851. 

 JV. I. Bowditch, Esq. 



A History of the Massachusetts General Hospital. By N. I. 

 Bowditch. 8vo. Boston, 1851. 

 Hon. Josiah Quincy. 



The History of the Boston Athenseum, with Biographical Notices 

 of its Deceased Founders. By Josiah Quincy. 8vo. Cambridge, 

 1851. 



