iv. CONTENTS. 



Anr. XVIII. — An attempt to classify the Longieorn Coleoptera of the part of America North of 



Mexico. By John L. Le Conte, M. D.,* ....... 139 



Art. XIX. — Description of two New Minerals and a New Earth. By David D. Owen, M. D., . 179 



PART III. JANUARY 1853. 



AiiT. XX. — Description of a Fossil Saurian of the New Red Sandstone Formation of Pennsylvania; 



with some account of that Formation. By Isaac Lea,t ..... 185 



.\nT. XXI. — On some New Fossil Molluscs in the Carboniferous Slates of the Anthracite Seams of 



the Wilkcsbarre Coal Formation. By Isaac Lea,J ..... 203 



Art. XXII. — On the Osteology of the Head of Hippopotamus, and a Description of the Osteolo- 



gical Characters of a New Genus of Hippopotamidffi. By Joseph Leidy, M. D., . 207 



Art. XXIII. — Synopsis of the species of Pterostichus Bon., and allied genera inhabiting temperate 



North America. By John L. Le Conte, M. D.,§ . . . . . 225 



Art. XXI v. — Descriptions of new species of Birds of the genera Melanerpes Swainson, and Lanius 



Linnaeus. By John Cassin, ........ 257 



Art. XXV. — Notes on the Birds of California, ob.served during a residence of three years in that 



country. By A. L. Heermann, M. D., . . . . . . 259 



Art. XXVI.— Descriptions of New Fossil Shells of the United States. By T. A. Conrad, . 273 



PART IV. FEBURARY, 1854. 



Art. XXVII. — Exotic Fungi from the Schweinitzian Herbarium, principally from Surinam. 



Revised by the Rev. iVI. J. Berkeley, M. A., F. L. S., and Rev. M. A. Curtis, D. D.,|| 277 



Art. XXVIII. — Descriptions of New Species of Unio. By T. A. Conrad, . . . 295 



Art. XXIX. — On some New Reptiles from Oregon and the Western Coast of Africa. By Edward 



Hallowell, M. D.. ......... 301 



Art. XXX. — Embryonic Development of Plauocera elliptica. By Charles Girard,^ . . 307 



Akt. XXXI — On Bathygnathus boreali?, an extinct Saurian of the New Red Sandstone of Prince 



Edward's Island, ......... 327 



Art. XXXI [. — Monagraph of the Genus Argonauta, Linnc, with descriptions of five new species. 



By T. A. Conrad, . . . . . . . . 331 



Art. XXXIII — Synopsis of the genera Parapholas and Penicilla. By T. A Conrad . . 334 



♦E.xtra copies piiiited tor the Author January, 1852. 



t " " " " May, 1852. 



t " " " " June, 1852. 



^ " ': " <t July, 1852. 



II " " " <i March, 1853. 



ir " " " « January, 1854. 



