IV. 



INDEX. 



" Remarks on the Birds of Upper 

 California," 40; on Dr. Morton's 

 description of two new species of 

 Echinodermata, from the Eocene of 

 the U. S., 41 ; on Dr. E. Hallow- 

 ell's paper on the anatomy of the 

 Harpyia destructor, 4'J ; on Dr. 

 Hallowell's description of a new 

 bat from Western Africa, 50; on 

 Dr. Leidy's " Remarks on the ana- 

 tomy of the abdominal viscera of 

 the Sloth," 50 ; on Dr. Leidy's paper 

 on the anatomy of Spectrum femo- 

 ratum,68; on Prof. Haldeman's de- 

 scription of Unio abacoides, 71; on 

 Dr. Leidy's description of a new 

 genus and species of Entozoa, 91 ; 

 on Prof. Owen's "Observations on 

 fossils from the Brunswick Canal, 

 Geo., in the cabinet of the Acad. 

 of Nat. Sciences of Philadelphia," 

 92; on Dr. Morton's description of 

 two living hybrid birds, between 

 Gallus and Numida, 97 ; on Dr. 

 Leidy's paper on the mechanism 

 which closes the membranous wings 

 of the genus Locusta, 98; on Prof. 

 Haldeman's paper on several new 

 genera and species of insects, 115; 

 on Mr. Cassin's "Note on an in- 

 stinct supposed to be possessed by 

 the Herons, especially the genus 

 Ardea L.." 123; on a paper by Mr. 

 Grant, of Philadelphia, on hybrid ity 

 in animals, 130; on Dr. Leidy's 

 paper on the situation of the ol- 

 factory sense in the terrestrial 

 tribe of thegasteropodous mollusca, 

 132 ; on a paper by Prof. Haldeman. 

 describing one new genus, and 

 several new species of insects, 147 ; 

 on Mr. Germain's paper on some 

 effects of Electricity and Galvanism, 

 having seemins analogy to the puri- 

 fication and circulation of the blood, 

 1 17 , on Mr. Tuomey's notice of 

 the cranium of Z^uododon cetoides 

 found near Charleston, S. C, 14 9: on 

 P. A. Browne's paper proposing a 

 new nomenclature for the class 

 mammalia, 192 ; on Mr. Cassin's 

 description of a new rapacious bird 

 in the collection ot the Academy of 

 Natural Sciences of Philadelphia, 

 198; on Dr. Gibbes' description o<" 

 fossil remains from the Eocene 

 green sand of South Carolina, 19S; 



on Lieut, Abert's description of a 

 new Quail, from New Mexico, 209 ; 

 on Dr. Le Conte's paper, " Frag- 

 menta Entomologica, 212; on Dr. 

 Hare's paper, " Objections to the 

 electrical theories of Franklin, Du- 

 fay and Ampere," 219; on Dr. 

 Leidy's paper "on the natural his- 

 tory of Belostoma," 231 ; on Major 

 McCall's description of a new 

 Pigeon from Mexico, 231; on Prof. 

 Haldeman's "descriptions of Cole- 

 optera, chiefly in the cabinet of Dr. 

 J. L. Le Conte," 239; on Dr. Mor- 

 ton's memoir on the position of the 

 ear in ancient statuary and paint- 

 ings, 243 ; on Prof. Haldeman's de- 

 scriptions of new Coleopterous in- 

 sects of the United States, 244 ; on 

 Dr. Leidy's description and anatomy 

 of a new subgenus of Planaria, 216; 

 on Dr. Leidy's paper on two new 

 species of Planaria, 247 ; on Dr. 

 Gibbes' description of new Squa- 

 lidae from the Tertiary of South 

 Carolina, 250 ; on Dr. Hallowell's 

 description of a new Coluber, 261 ; 

 on Dr. Leidy's paper on the Fossil 

 horse of America, 201 ; on Mr. 

 Conrad's " Observations on the Eo- 

 cene formation and descriptions of 

 105 new fossils from the vicinity of 

 Vicksburg, Miss.," 276; on Prof. 

 Haldeman's description of a new 

 Unio, 312 ; on Dr. Leidy's paper on 

 a new genus and species of fossil 

 Ruminant*. Poebrotherium Wilsoni, 

 318; on Dr. Hallowell's paper on 

 the horned viper of Western Africa, 

 318; on Mr. Cassin's paper on two 

 species of Buceros, probably new, 

 &c, 328; on Mr. Cassin's descrip- 

 tions of three species of the genus 

 Icterus, presumed to be new, Sec'., 

 329. 



Conrad, T. A., don. to mus..236, 239, 

 255, 269; don. to lib., 256, 261 ; 

 descriptions of new species of fos- 

 sil and recent shells and corals, 19; 

 observations on the Eocene forma- 

 tion, and description of 105 new 

 fossils of that period, from the vi- 

 cinity of Vickrburg, Miss., 280. 



Correspondents elected : 



Aall Nicolai, Christiana, Sweden, 



48. 

 Adams, Prof. C. B., Vermont, 115. 



