) 





CONTENTS. 



PARTI. FEBRUARY, 1862. 



ART. I. — On the Chilopoda of North America, with a catalogue of all the specimens in the Collec- 

 tion of the Smithsonian Institution. By Horatio C. Wood, Jr., 1 . . . .5 

 ART. II.— New Unionidse of the United States. By Isaac Lea, 2 . . . . 53 



PART II. OCTOBER, 1862. 



ART. III. — Monograph of the Fossil Polyzoa of the Secondary and Tertiary Formations of North 



America. By Wui. M. Gabh and G. H. Horn. M. D.. 3 . . . Ill 



ART. IV. — Descriptions of New Birds from Western Africa, in the Museum of the Academy of 



Natural Sciences of Philadelphia. By John Cassin. 4 . . . . . 181 



ART V. — New Unionidse of the United States and Arctic America. By Isaac Lea," . 187 



PART III. MARCH . 1863. 

 ART. VI.— New Melaaidas of the United States. By Isaac Lea. . . 'J IT 



PART 1 V . NOVEMBER, 1863. 

 ART. VII.— On the Pedipalpi of North America. By Horatio C. Wood, Jr., M. P.. 7 . 358 



ART. VIII.— New Exotic Unionidse. By Isaac Lea, s . . . . . .377 



ART. IN. — Descriptions of the Soft Parts of one hundred and forty-three species and some Embryonic 



Forms of Unionidae of the United States. By Isaac Lea,'' 1 ..... 401 

 ART. X. — Description of new and little known species of Birds of the family Picida? in the Museum 



of the Academy of Natural Sciences of Philadelphia. By John Cassin, 10 . . . 457 



l Extra copies .printed for the Author, February, 1862. 



■> " - February, [862 



:: •■ » " ■• October, 1862. 



-I • • > ■■ October, 1862. 



5 • •' •■ •■ Oi tober, 1862 



r •• •■' >> March, 18 



7 ■■ " ■' ........ Si 



; ■• •' N > 



:i " ■' November, I 



in November. 1863 



