IV 



CONTENTS. 



Page 

 Art. XII L Description of a New Species of Polypterus, from West 



Africa. By W. O. Ayres, Boston . . . 241 



Art. XIV. Observations on the Fishes of Nova Scotia and Labrador, 

 with Descriptions of New Species. By Horatio Rob- 

 inson Storer, Boston . . . . . 247 

 Art. XV. Descriptions and Figures of the Araneides of the United 

 States. By Nicholas Marcellus Hentz, Tusca- 

 loosa, Alabama. [Concluded from page 35.] . . 271 

 Art. XVI. A few Ornithological Facts, gathered in a hasty Trip 

 through portions of New Brunswick and Nova Scotia, 

 in June, 1850. By T. M. Brewer, M. D., Boston 297 

 Art. XVII. Notice of the Egg of Thalassidroma Leachii, with Descrip- 

 tions of the Eggs of Procellaria Bulwerii, Procellaria 

 obscura, and Puffinus major. By T. M. Brewer, M. D., 



Boston 308 



Art. XVIII. Description of five new Species of Birds, and other 

 Ornithological Notes of Cuban Species. By John 



Gundlach, Havana, Cuba 313 



Art. XIX. The Organic Relations of some of the Infusoria, including 

 Investigations concerning the Structure and Nature of 

 the Genus Bodo, (Ehr.) By W. I. Burnett, M. D., 



Boston 319 



Art. XX. Notes and Observations on the Analysis and Character of 



the Soils of the Scioto Valley, Ohio, with some general 



Considerations respecting the subject of Soil Analyses. 



By David A. Wells, Cambridge .... 324 



Art. XXI. On the Skeleton of the Great Chimpanzee, Troglodytes 



gorilla. By Samuel Kneeland, Jr., M. D., Boston 336 

 Art. XXII. A Monograph of the Species of Pisidium, found in the 



United States of North America. By Temple Prime 348 

 Art. XXIII. Description (with figure) of Menobranchus punctatus. By 



Lewis R. Gibbes, M. D., Charleston . . . 369 

 Art. XXIV. Descriptions of Shells from the Gulf of California and the 

 Pacific Coasts of Mexico and California. By Augus- 

 tus A. Gould, M. D., Boston .... 374 

 Art. XXV. New Species of Fossil Plants, from the Anthracite and 

 Bituminous Coal-fields of Pennsylvania ; collected and 

 described by Leo Lesquereux. With Introductory 

 Observations by Henry Darwin Rogers . . 409 

 Art. XXVI. Observations on the Development of Anableps Gronovii, 



(Cuv. & Val.) By Jeffries Wyman, M. D. . 432 



Art. XXVII. On the Crustacea and Echinodermata of the Pacific Shores 



of North America. By William Stimpson . . 444 

 Art. XXVIII. A List of the Fishes collected in California by Mr. E. 

 Samuels, with Descriptions of the New Species. By 

 Charles Girard, M. D. 533 



