IV. 



INDEX. 



Club of Members, don. to mus., by, 29. 



Committees, Scientific, for 1818, '2 : for 

 1849, 148. 



Committee on Mr. Nuttall's descrip- 

 tions of new plants from the Rocky 

 Mountains ami California, collected by 

 W. Gambel, 3 ; on Dr. Leidy's paper 

 on some bodies in the Boa constrictor 

 resembling the Pacinian corpuscles, 

 3 ; on Mr. Cassin's descriptions of 

 new species of Cyanocorax, 7 ; on Dr. 

 Bachman's Notes on the generation 

 of the Virginian Opossum, ST); on Dr. 

 Hallo well's descriptions of two new 

 species of Onychocephahis from Africa 



35 ; on Dr. Mydleton Mitchell's re- 

 marks on the generation of the Opos- 

 sum, 3G ; on Mr. Henrv C. Lea's 

 catalogue of the Tertiary Testacea of 

 the U. S., 36 ; on Dr. Leidy's descrip- 

 tion of Merycoidodon Culbertsonii, 



36 ; on Dr. Dickeson's paper, Micro- 

 scopic examination of the development 

 of the foetus of the Succinia amphibia, 

 57; on Major M'Call's Notes on Mexi- 

 can birds heretofore not fully de- 

 described, 58 ; on Mr. Conrad's ob- 

 servations on new Eocene fossils from 

 Vicksburg, Mississippi, 58; on Dr. 

 R. W;, Gibbes Monograph of the fossil 

 Squalids of the U. S., 65; on Mr. 

 Cassin's descriptions of new species 

 of Vidua, Euplectes, Pyrenestes and 

 Pitylus, 65 ; on Dr. Gambel's descrip- 

 tion of a new Mexican Quail, 74; on 

 Dr. Gambel's descriptions of new 

 Californian Quadrupeds, 76 ; on Dr. 

 Hallowell's Notes of the post-mortem 

 appearances observed in a Cynocepha- 

 lus porcariuSjSo ; on Mr. Cassin's de- 

 scription of a new Tanager from the 

 Rio Negro, 84 ; on Mr. Pease's paper 

 on the Geology and Natural History 

 of part of Mexico, 85 ; on a Catalogue 

 of Mexican birds by the same, 85; on 

 Mr. Conrad's descriptions of new 

 species of recent Shells, 120: on Dr. 

 Gambel's Catalogue of the Columbidac 

 in the collection of the Academy, 120; 

 on Mr. Cassin's descriptions of new 

 Owls, 120; on Dr. Gambel's Contri- 

 butions to American Ornitholojy, 

 120; on Dr. Hallowell's description 

 of a new Salamander from California, 

 120 ; on Dr. Morton's Additional ob- 

 servations on a new livins species of 

 Hippopotamus, 149 ; on Mr. Cassin's 

 Catalogue of the Vulturidae and Stri- 

 gidae in the collection of the Academy, 

 150; on Mr. Cassin's descriptions of 



new species of Nyctale and Sycobius, 

 150; on Mr. Conrad's descriptions of 

 new fresh-water and Marine Shells, 

 150; on Mr. Cassin's notes on the 

 Vulturida; and Strigidae in the collec- 

 tion of the Academy, 150; on Dr. 

 Hallowell's notes of a post-mortem 

 examination of a Cynocephalus, 150; 

 on Dr. Gambel's remarks on the 

 Birds of Upper California, 169; on 

 Dr. Gambel's Notes on the Pidgeons, 

 169 ; on Prof. Haldeman's description 

 of new species of Cryptocephalus, 

 169; on Dr. Keller's memoir on Cili- 

 ary cells of some marine naked Mol- 

 lusca, in embryo, 109 ; on Dr. Meigs* 

 observations on the reproductive or- 

 gans and on the foetus of the Delphinus 

 nesarnak, 172 ; on Dr. Leidy's re- 

 marks on the fragments of Tapirus 

 Americanus fossilis in the collection 

 of the Academy, 179 ; on Dr. Hal- 

 lowell's description of a new species 

 of Eryx, 183; on Dr. Savage's com- 

 munication on the Driver Ants of 

 West Africa, 184; on Prof. Halde- 

 man's descriptions of new species of 

 Hymenoptera, 193 ; on Dr. Savage's 

 paper on the Termitidae of West 

 Africa, 209 ; on Mr. Van Amringe's 

 letter proposing a new system of 

 Zoological classification, 224 ; on Mr. 

 Cassin's descriptions of new species 

 of Caprimulgida;, 234 ; on Dr. Gibbes* 

 descriptions of new species of Mylio- 

 bates from the Eocene of South Caro- 

 lina, 245 ; on Dr. Leidy's descriptions 

 of two species of Distoma, 247 ; on 

 Dr. Leidy's description of new Ento- 

 phyta, 248 ; on Dr. Le Conte's paper 

 "an attempt to classify the Longicorn 

 Coleoptera of America north of 

 Mexico," 248 ; on Dr. Morton's paper 

 on the size of the brain in the various 

 races of Man, 248 ; on a paper by 

 Professor Baird, Revision of the North 

 American Tailed-Batrachia, 204. 



Committee on Dr. Savage's paper on 

 the Driver Ants of West Africa, ob- 

 servations by, 200. 



Conrad, T. A., don. to mus., 138; don. 

 to lib., 30; Descriptions of two new 

 genera, and new species of recent 

 shells, &c., 121; descriptions of new 

 fresh-water and marine shells, 152. 



Cook, John, don. to mus., 69 ; don to 

 lib., 205. 



Cooper, C. C, don. to lib., 52. 



Correspondents elected: 



Blythe, Edward, Calcutta, 78. 



