384 



Louis Agassiz. 4to. Pamph. Cambridge, 1850. From the 

 Author. 



Descriptions of some American Annelida abranchia. By- 

 Joseph Leidy, M. D. 4to. Pamph. Philadelphia, 1850. From 

 the Author. 



Proceedings of the Academy of Natural Sciences. Vol. V. 

 Nos. 3, 4. pp. 53-79. Philadelphia, 1850. From the Academy 

 of Natural Sciences. 



Bibliographia Zoologise et Geologise. By Prof. Louis Agassiz. 

 Vol. 2d. 8vo. London, 1850. Ray Society''s Publications. 



Message of the President of the United States and accompany- 

 ing Documents. 8vo. Washington. Part 3d, 1849. From C. T. 

 Jackson. 



Report of the Commissioner of Patents for 1849 - 50. Part I. 

 Mechanics. From R. C. Winthrop. 



American Journal of Science and Arts. No. 30, for Nov. 2d 

 Series. New Haven. Fro77i the Editors. 



Journal of the Academy of Natural Sciences of Philadelphia. 

 New Series. Vol. II. Part I. 4to. 1850. Fro7n the Academy 

 of Natural Sciences. 



Development and Homologies of the Molar Teeth of the Wart 

 Hogs (Phacochserus) 4to. Pamph. By Prof. Owen. London, 

 1850. Fro7n the Author. 



Catalogue of Shells contained in the Collection of John C. 

 Jay, M. D. 4th Ed. 4to. New York. From J. C. Jay. 



Message of the President of the United States, communicating 

 the Report of Lieut. Webster of the Survey of the Gulf Coast at 

 the mouth of the Rio Grande. 8vo. Pamph. 1850. Washing- 

 ton, D. C. From R. C. Winthrop. 



Charter, Constitution, and By-Laws of the Troy Lycseum of 

 Natural History, and Catalogue of its Officers and Members. 

 8vo. Pamph. New York, 1850. From the Troy Lycceum. 



Proceedings of the Academy of Natural Sciences of Philadel- 

 phia. Vol. V. No. 5. pp. 81-115. From the Academy of 

 Natural Sciences. 



Report of the Exploration of the Territory of Minnesota. By 

 Brevet Capt. Pope. 8vo. Pamph. (Congressional Document.) 

 Washington, D. C, 1850. From R. C. Winthrop. 



