CONTENTS. 



PART I. DECEMBER, 1847. 



Art. I. — On the Fossil genus Basilosaurus, Harlan, (Zeiiglodon, Owen,) with a notice of 

 Specimens from the Eocene Green Sand of South Carolina. By Robert W. Gibbes, 

 M. D., of South Carolina, Correspondent of the Academy of Natural Sciences of 

 Philadelphia ; of the New York Historical Society, &c., - - - . . 5 



Art. n. — Notice of the Discovery of a Cranium of the Zeuglodon, (Basilosaurus.) By M. 

 Tuomey, State Geologist of South Carolina ; Corresponding Member of the Academy 

 of Natural Sciences of Philadelphia, ------- ..jg 



Art. ni. — Observations on certain Fossil Bones from the collection of the Academy of Natural 

 Sciences of Philadelphia. By Richard Owen, Esq., F. R. S., Professor of Comparative 

 Anatomy in the Royal College of Surgeons, London, &,c., &c., - - - - 18 



Art. IV. — Description of a new rapacious Bird in the Museum of the Academy of Natural 



Sciences of Philadelphia. By John Cassin, ---_.. .21 



Art. V. — Remarks on the Birds observed in Upper California, with descriptions of New 



Species. By William Gambel, -- 25 



Art. VI. — 1. History and Anatomy of the Hemipterous Genus Belostoma. By Joseph Leidy, 



M. D. 2. Miscellanea Zoologica. By Joseph Leidy, M. D., - - - . 57 



Art. VII. — Fragmenta Entomologica. Auctore J. L. Le Conte, M. D., - - - - 71 



PART II. AUGUST, 1848. 



Art. VIII. — Descriptions of North American Coleoptera, chiefly in" the Cabinet of J. L. Le 



Conte, M. D., with reference to described species. By S. S. Haldeman, - - 95 



ART. IX. — Observations on the Eocene formation, and descriptions of one hundred and five 

 new fossils of that period, from the vicinity of Vlcksburg, Mississippi ; with an 

 Appendix. By T. A. Conrad, . -Ill 



Art. X. — Description of a new Buceros, and a notice of the Buceros elatus, (Temm.,) both of 

 which are in the collection of the Academy of Natural Sciences of Philadelphia. By 

 John Cassin, ----------- __j 35 



Art. XI. — Descriptions of three new species of the genus Icterus, (Briss.,) specimens of 

 which are in the Museum of the Academy of Natural Sciences of Philadelphia. By 

 John Cassin, _--. J37 



Art. XII. — Monograph of the Fossil Squalidse of the United States. By Robert W. Gibbes, 



M. D., of South Carolina, Correspondent of the Academy of Natural Sciences, &c., - 139 



Art. XIII. — Descriptions of Plants collected by William Gambel, M. D., in the Rocky 



Mountains and Upper California. By Thomas Nuttall, - . . - . 149 



