CONTENTS. 



Description of some Crystals of Sulphate of Strontian, 



from Lake Erie, by G. Troost, M. D. 300 



Account of some of the Marine Shells of the United 



States, by Thomas Say, (concluded) 202 



Geological Sketches of the Mississippi Valley, by Ed- 

 win James, M. D. 326 



Description of a Quadruped belonging to the order 



Rodentia, by Thomas Say. 330 



P Description of a Squalus of very large size, which was 

 taken on the coast of New Jersey, by C. A. Le- 

 sueur. 342 



On a South American species of CEstrus which inhabits 



the human body, by Thomas Say, 353 



On two remarkable Hepatic Mosses found in North 



Carolina, by L. D. Schweinitz, 368 



Description of Univalve Terrestrial and Flu viatile Shells 



of the United States, by Thomas Say, "73 



Note, 382 



Catalogue of the Library, (continued) 383 



List of Donors to the Library, 392 



List of Donations to the Museum with the Donor's names, 394 



t, Alphabetical Index to Volume II. 404 



, List of Plates, 411 



Errata, 413 



