IV. 



INDEX. 



Neuropterology of the U. States, by 

 Phil. R. Uhler, 73 ; on descriptions 

 of twelve new species of Naiades, by 

 Isaac Lea, 73 ; on the Caducibranchi- 

 ate Urodele Batrachians, by Edward 

 Hallowell, M.D., 75 ; onTrigonophrys 

 i-ugiceps, ib. 73 ; on synopsis of the 

 species Cliyina and allied genera in 

 the U. States, by John L. Le Conte, 

 M. D., 75 ; on investigation of the 

 Rock Guano of the islands in the 

 Caribbean Sea, by J. W. Taylor, 75 ; 

 on description of six new species of 

 Unio from Alabama, by Isaac Lea, 

 75 ; on description of eight new spe- 

 cies of Naiades from various parts of 

 the TJ. States, ib., 75 ; on description 

 of three new exotic species of Nai- 

 ades, ib., 75 ; on list of extinct Ver- 

 tebrata, from the region of the Mis- 

 souri, with remarks upon their geo- 

 logical age, by Joseph Leidy, M. D., 

 75 ; on description of six new spe- 

 cies of fresh water and land shells, 

 by Isaac Lea, 101 ; on examination 

 of a nickel meteorite from Oktibbeha 

 county. Miss., by W. J. Taylor, 101 ; 

 on a supposed new species of mock- 

 ing bird, by Col. J. J. Abert, 104; on 

 explorations under the War Depart- 

 ment ; descriptions of new Creta- 

 ceous and Tertiary Fossils, collected 

 by Dr. F. V. Hayden in Nebraska, 

 with some remarks on the geology 

 of the Upper Missouri country, by 

 F. B. Meek and F. V. Hayden, M. D., 

 104 ; on notes explanatory of a map 

 and section illustrating the geolo- 

 gical structure of the country bor- 

 dering on the Missouri River, from 

 the mouth of Platte River to Fort 

 Benton, in lat. 47° 30' N., long. 110° 

 30' W., by F. V. Hayden, M. D., 107 ; 

 on the larva of Thyreus Abbotii, by 

 J. P. Kirtland, M. D., 107; on notes 

 on the geology of the Mauvaises Ter- 

 res of White River, Nebraska, by F. 

 V. Hayden, M. D., 149; on prodro- 

 mus descriptionis animalium everte- 

 bratorum, qu^e in Expedition! ad 

 Oceanum Pacificum Septentrionalem 

 a Ropublica Federata missa^Cadwal. 

 Ringgold et Job. Rogers ducibus, 

 observ. et descrip. W. Stimpson, 149 ; 

 on description of two new genera of 

 Shells, and rectification of some of 

 the generic names of American Ter- 

 tiary Fossils, by T. A. Conrad, 149; 

 on notices of the remains of Extinct 

 Fishes, by J. Leidy, M. D., 150 ; on 

 description of a new species of Mya- 



cites, by T. A. Conrad, 150 ; on des- 

 cription of a new genus of the family 

 DreissenidEe, ib., 150 ; on examina- 

 tion of Enargite, from New Grenada, 

 by W. J. Taylor, 150; on descrip- 

 tions of twenty-seven new species of 

 Uniones from Georgia, by Isaac Lea, 

 151 ; on three new species of Vesper- 

 tilionidse, by Maj. John Le Conte, 

 173 ; on observations on the Wild 

 Turkey, ib., 173; on descriptions of 

 some new Reptiles, collected by the 

 U. S. Exploring Expedition under 

 command of Capt. Charles Wilkes, 

 U. S. N., 3d part, by Chas. Girard, 

 175 ; on rectification of the references 

 of certain of the extinct mammalian 

 genera of Nebraska, by J. Leidy, 

 M. D., 175; on notes on American 

 Land Shells, No. 2, by W. G. Binney, 

 183 ; on descriptions of some new 

 Reptiles collected by the U. S. Ex- 

 ploring Expedition under the com- 

 mand of Capt. C. Wilkes, U. S. N., 

 by Chas. Girard, 194 ; on notices of 

 new genera and species of marine 

 and fresh water Fishes from Western 

 North America, by Chas. Girard, 194 ; 

 on description of a new species of 

 Cypselus, collected in the N. W. 

 Boundary Survey, A. Campbell, Com- 

 mis., by C. B. R. Kennerly, 194 ; on 

 notes on the American species of 

 Archibuteo and Lanius, and descrip- 

 tion of a new species of Toucan, of 

 the genus Selenidera, by John Cas- 

 sin, 194; on description of several 

 new North American Reptiles, by E. 

 Hallowell, M. D., 203 ; on descrip- 

 tions of Exotic Genera and species 

 of the family Unionidae, by Isaac 

 Lea, LL. D., 203 ; on prodromus des- 

 criptionis Animalium Invertebrato- 

 rum quEe in Expeditione ad Oceanum 

 Pacificum Septentrionalem a Repub- 

 lica federata missa Cadwal. Ring- 

 gold et Joh. Rodgers ducibus, observ. 

 et descrip. W. Stimpson, Pars tertia, 

 205 ; observations on a group of 

 Fossil Shells found in Tippah Co., 

 Miss., with descriptions of fifty-five 

 new species, by T. A. Conrad, 205. 



Committees : on memorial to Congress, 

 by Dr. Leidy, 1 ; to make arrange- 

 ments relative to funeral of Dr. E. K. 

 Kane, 73. 



Committees, election of Standing, 2. 



Correspondents elected : Brig. Gen. 

 Harney, U. S. A., Capt. Alfred Plea- 

 souton,'228. 



Corse, Dr. B. M., remarks on the de- 



[1857. 



