CONTENTS. iv 



Description of a Hydrostatic Balance, by which the specific 

 gravities of minerals may be ascertained without calcula- 

 tion. By Benjamin H. Coates, M. D. . . . 368 

 Observations on the genus Glycine, and some of its kindred 



genera. By Stephen Elliott (concluded) . . 371 



An account of the Crustacea of the United States. By Thomas 



Say, (continued.) 374 



A case of an unusual arrangement in the ascending Cava and 

 in the external Jugular Veins of the human subject. By 



William E. Horner, M. D 401 



Notes on Professor Green's paper on the Amphibia, published 



in the September number of this Journal. By Thomas Say. 405 

 Description of three species of Fish. By Samuel L. Mitchill, 



M. D 407 



Description of several new species of the genus Esox of North 



America. By C. A. Le Sueur. .... 413 



Description of three new genera of fluviatile fish, Pomoxis, Sar- 



chirus, and Exoglossum. By C. S. Rafinesque. . 417 

 An account of the Crustacea of the United States. By Tho- 

 mas Say (concluded.) ...... 423 



Observations on some of the Animals described in the account 



of the Crustacea of the United States. By the same. 442 



Appendix to the account of the Crustacea of the United States. 



By the same 445 



Description of a new genus of fresh water bivalve Shells. By 



the same. ......... 459 



Description of two new species of Linnxan Lacerta. By Jacob 



Gilliams 460 



An account of Minerals at present known to exist in the vici- 

 nity of Philadelphia. By Isaac Lea 462 



Description of three new species of the Genus Naesa. By 



Thomas Say 482 



Remarks of the Publishing Committee. .... 485 

 Alphabetical Index, Zoological and Botanical. . . . 487 

 Catalogue of the Library (continued.) . . . . 491 

 List of Donors to the Library. . . . - • 497 



List of Donations to the Museum 499 



List of Donations to the Apparatus 504 



Reference to the Plates of Vol. i. . . ■ • • 505 



