15 
TEUBNER & CO., 60, PATEENOMEE EOW. 
Journal of the Academy of Natural Sciences of Philadelphia-^ ContMmd. 
Description of a Dydrostatic Balance* by which the Specific Gravity Of Miherkls may 
be ascertained without calculation, by Benjamin H. Coates, M.D. 
Observations on the Genus Glycine, and some of its kindred Genera, by Stephen Elliott 
(concluded). 
An Account of the Crustacea of the United' States, by Thomas Say (continued). 
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. 
Notes on Professor Green’s Paper on the Amphibia, published in the September 
number of this Journal* by Thbmas Say. 
Description of three Species of Fish, by Samuel L. Mitchill, M.D. 
Description of several New Species of the Genus Essox of North America, by C. A. 
Le Sueur. 
Description of three New Genera of Fluviatile Fish, Pomoxis, Sarchirus, and Exo- 
■ glossum, by C. S. Rafinesque. 
An Account of the Crustacea of the United States, by Thomas Say (concluded). 
Observations on some of the Animals described in the Account of the Crustacea of the 
United States, by the same. ’ 
Appendix to the Account of the Crustacea of the U. S., by the same. 
Descriptions of a New Genus of Fresh-Water Bivalve Shells, by the same. 
Description of New Species of Linneeah Lacerta, by Jacob Gilliams. ■ 
An Account of Minerals at present known to exist in the vicinity of- Philadelphia, by 
' Isaac Lea. 
Description of three Species of the Genus Naesa, by Thomas Say. 
Remarks of the Publishing Committee. 
Alphabetical Index, Zoological and Botanical. 
Catalogue of the Library (continued). 
List of Donors to the Library. 
List of Donations to the Museum. ' ; ■ : 
List of Donations to the Apparatus. . 
Reference to the Plates of vol. i. »• 
Yol. II. Part I. II Plates. 8vo, pp. iv., 192, and xv. Philadelphia, 1821. 
CONTENTS. ! ’< ; 
Officers of the Academy of Natural Sciences, for the year 1821. 
Description of a New Genus and several New Species of Fresh-water Fish, indi¬ 
genous to the United States, by C. A. Le Sueur. 
Description of two New Species of Exocetus, by C. A. Le Sueur. 
Descriptions of the Thysanour® of the United States, by Thomas Say. 
Observations on the Geological Structure 6f the Valley of “Mississippi, by Thomas 
• Nuttall. 
Notice concerning a New Species of American Spider, whose web is used in Medicine, 
by N. M. Hentz. 
Description of some New Crystalline Forms of Phosphate of Lime and Zircon, by Dr. 
G, Troost. ■■ 
Descriptions of the Arachnides of the United States, by Thomas Say. 
Analysis of the Blue Iron Earth of New Jersey, by Lardner Vanuxem. 
Descriptions of several NeAv Species of Cuttle-fish, by C. A. Le Sueur. 
Descriptions of the Myriapod® of the United States, by Thomas Say. 
Descriptions of some New Species of Plants recently introduced into the Gardens of 
Philadelphia, from the Arkansa Territory, by Thomas Nuttall. 
Observations on several Genera and Species of Fish belonging to the Natural Family 
of the Esoces, by C. A. Le Sueur. 
Analysis of some American Minerals, by Henry Seybert. 
On two Veins of Pyroxene or Augite in Granite, by Lardner Vanuxem. 
Description of Univalve Shells of the United States, by Thomas Say . 
Description of rare Plants recently introduced into the Gardens of Philadelphia, by 
Thomas Nuttall. 
Description and Analysis of the Table-Spar, from the vicinity of Willsborough, Lake 
Champlain, by Lardner Vanuxem. 
Geological and Mineralogical Notice of a portion of the North-Eastern part of the State 
of New York, by Augustus.D. Jessup. 
Note by Publishing Committee. 
Yol. II. Part II. pp. 193 to 408. "5 Plates, 1 Map. Philadelphia, 1822. 
HHO.i -/.HivA i.i i CONTENTS. 7 GfiO 
Officers of the Academy of Natural Sciences for the year 1822., 
Description and Analysis of the Jeffersonite, a new Mineral, by W. H. Keating. 
