CONTENTS. 



PAET I. JULY, 186 6. 

 ART. I. — New Uniouidas, Melanidte, etc., chiefly of the United States. By Isaac Lea,^ . 5 

 AET. II. — On the Structures and Distribution of the Genera of the Arciferous Anura. 



By Edward D. Cope,^ 6T 



PART II. SEPTEMBER, 18 6 7. 

 ART. III. — New UnionidiB, Mehmidas, etc., chiefly of the United States. By Isaac Lsa,' 113 

 ART. IV. — On the Families of the Raniform Anura. By. Edward D. Cope,^ . 



PART III. JANUARY, 186 9. 



ART. A^. — On the Distribution of Fresh-water Fishes in the Allegheny Region of South 



■western Virginia. By E. D. Cope, A.M.,^ 



ART. VI. — New Unionidre, Melanidte, etc., chiefly of the United States. By Isaac Lea,' 



PART IV. AUGUST, 18 6 9. 

 ART. VII. — New Unionidte, Melanida3, etc., chiefly of the United States. By Isaac Lea," 303 

 ART. VIII. — An attempt to ascertain the Average "Weight of the Brain in the different 

 Races of Mankind. By Joseph Barnard Davis, M.D., F.R.S., Corresponding 

 Member of the Academy of Natural Sciences of Philadelphia, etc.,^ 

 ART. IX. — On Brevoortia. By Alphonso Wood,^ 



189- 



207 

 219 



315 



369- 



1 Extra copies piintctl for the Author, 



3 



4 

 5 

 6 

 7 

 S 

 9 



May, 186G. 

 July, 186(3. 

 December, 1866. 

 August, 1867. 

 December, 1863. 

 December, 1868. 

 December, 1868. 

 July, 1869. 

 .\uo;ust, 1869. 



