﻿5 6 (o, 13 



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CONTENTS. 



PART I. DECEMBER, 18 58. 



ART. I. — Descriptions of new species of Birds of the genera Selenidera, Gould, and Numida, 

 Linnaeus; and of a new genus and species of Rasorial bird in the Museum of the Academy of 

 Natural Sciences of Philadelphia. By John Cassin, 1 ..... 



ART. II. — Catalogue of Coleoptera of the Regions adjacent to the Boundary Line between the 

 United States and Mexico. By John L. Le Conte, M. D., 2 .... 



ART. III. — Descriptions of the Embryonic Forms of Thirty-eight species of Unionidse. By Isaac 

 Lea, LL. D., 3 .......... 



ART. IV.— New Unionidse of the United States. By Isaac Lea, LL. D., 4 



9 



43 

 51 



PART II. SEPTEMBER, 1859. 



ART. V. — Synopsis of North American Sphingidse. By Breckenridge Clemens, M. D., 5 

 ART. VI. — New Unionidae of the United States. By Isaac Lea, LL. D., 6 



97 

 191 



PART III. MARCH, 1860. 



ART. VII. — Descriptions of Exotic Unionidse. By Isaac Lea, LL. D., 7 . . 235 



ART. VIII. — Descriptions of New Species of Cretaceous and Eocene Fossils of Mississippi and 



Alabama. By T. A. Conrad, 8 . . . . . . . 275 



ART. IX. — Descriptions of some New Species of Cretaceous Fossils. By Wm. M. Gabb, 9 . 299 



ART. X. — Descriptions of New Species of Fossils, probably Triassic, from Virginia. By Wm. M. 



Gabb, 10 .......... 307 



ART. XI. — Reflections upon the nature of the Temporary Star of the year 1572. An application of 



the Nebular Hypothesis. By Alexander Wilcocks, M. D., 11 .... 309 



i Extra copies printed for the Author, ..... December, 1858. 



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