INDEX. 



genera, 21, 33 ; synopsis of the sub- 

 family Percinae, 21, 44 ; synopsis 

 generum Rhyptici et affinium, 21, 

 52 ; on the identity of the genera 

 Neoinsenis of Girard and Lutjanus of 

 Bloch, 73, 93 ; revision of the ge- 

 nera of SciEeninse of N. America, 73, 

 79 ; communication on several new 

 generic types of fishes, 77 ; on the 

 Haploidonotinas, 9S, 100 ; on the 

 genus Anisotremus, 98, 105 ; ex- 

 hibited and described two new spe- 

 cies of marine fishes, 98 ; synopsis 

 of the Uranoscopoids, 100, 108 ; 

 notes on some genera of fishes of the 

 western coast of N. America, 103, 

 164; on a new type of Aulostoma- 

 toids, 153, 168 ; on the genus Podo- 

 thecus, 258 ; description of a new 

 generic type of Blennoids, 258, 261 ; 

 monograph of the tridigitate Uranos- 

 copoids, 258, 263 ; synopsis of the 

 Polynematoids, 258, 271; synopsis 

 of the Sillaginoids, 391, 501 ; ditto 

 of the Notothenoids, 391, 512; ditto 

 of the Harpagiferoids, 391, 510 ; ditto 

 of the Chffinichthyoids, 391. 507. 



Goose, communication in reference to 

 a new species of, from Arctic Ame- 

 rica, by J. Cassin, 72. 



Graham, Col. J. D., letter from, men- 

 tioning discovery by him of a diurnal 

 tide in Lake Michigan, 1. 



Grouse, description of a new species of, 

 by G. Suckley, M. D., 361. 



Haploidonotinse, by T. Gill, 100. 



Harpagiferoids, synopsis of, by T. Gill, 

 510. 



Hayden, F. V., M. D., description of 

 fossils collected in Nebraska, &c, 

 390, 415. 



Hayes, Dr. Isaac I., invitation to ad- 

 dress the Academy in reference to 

 his late Arctic Expedition, 334 ; com- 

 plies with said request and places 

 his collection at the disposal of the 

 Academy, 335. 



Helix, description of two new species 

 of, by A. D. Brown, 333. 



Hemiptera, descriptions of four species 

 of, by P. R. Uhler, 284 ; rectification 

 of the paper upon, of the North Pa- 

 cific Exploring Expedition, 286. 



Homoptera, of the N. Pacific Exploring 

 Expedition, by P. R. Uhler, 282. 



Horn, George H., M. D., monograph of 

 the Polyzoa of the secondary and 



tertiary formations of the United 



States, 334, 335. 

 Huffnagle, Dr. Chas., announcement 



of the death of, by Mr. Sergeant, 1. 

 Hyporthodus flaviculata, new species 



described by T. Gill, 98. 



lo, descriptions of seven new spe> i< j s 

 of, by I. Lea, 393. 



Kalemys, young of, exhibited by J. 

 Ennis, showing affinities of the ge- 

 nus, 124. 



Keim, Geo. M., announcement of the 

 death of, 150. 



Kennicott, Robert, on three new forms 

 of Rattlesnakes, 205, 206. 



Lea, Isaac, descriptions of twenty-five 

 new species of Unionidae from Ga., 

 xc, 21, 38 ; description of a new 

 species of Neritina from Coosa River, 

 Ala., 21, 55 ; descriptions of two new 

 species of Anodouta, from Arctic 

 America, 21, 56 ; descriptions of new 

 species of Anodonta and Lithasia, 

 24, 54 ; descriptions of twelve new 

 species of Unioiies from Alabama, 

 56, 59 ; exhibited specimen of slag 

 in form of a cotton-like mass, 73 : 

 description of new genus of Mela- 

 niada?, &c., 77, 96 ; descriptions of 

 forty-nine new species of the genus 

 Melania, 100, 117 ; descriptions of 

 new fossil Mollusca from the cre- 

 taceous formation at Haddonfield, 

 N. J., 124, 148 ; new Unionida? of 

 the United States, 334, 335 ; descrip- 

 tions of eleven new species of Unio, 

 391 ; descriptions of seven new spe- 

 cies of the genus lo, 391, 393. 



LeConte, John L., M. D., new species 

 of Coleoptera of the Pacific district of 

 the United States, 334, 338 ; Coleop- 

 terous Fauna of Lower California, 

 334, 335. 



Lewis, Dr. Francis W., notes on new 

 and rare species of Diatornaceae of 

 the United States, 56, 61. 



Lewis, Dr. James, extract of a letter 

 from, in reference to three species 

 of Paludina in the Erie Canal, 2 ; 

 remarks on a very sudden fall of 

 temperature at Mohawk, N. Y., with 

 diagram, 22 ; letter in relation to 

 habits and growth of Unionida?, 57. 



I Leidy, Dr. J., announced discovery of 

 lignite at the border of the new red 

 sandstone on Plymouth Creek, 77. 



