INDEX TO VOL. IV. 



N. B. New genera and species are in italics. 



Acaridoe, reproduction of, 226. 

 Acephala, classification of, by William 



Stimpson, 125. 

 Adams, Prof. C. B. notice of, 307. 

 Address, Annual, for 1853, communica- 

 tion on, 347. 

 Adeorbis costulata, 14. 

 Agave Americana, economic value of 



fibres of, 330. 

 AlgiB marine, depth of water inhabited 



by them, 98. 

 Alligator, observations on, 240. 

 Alluvial Soils of Ohio, 68. 

 Alps and Jura, 33. 

 Amblvopsis spelceus, structure of eves 



of, 395. 

 Ammonite, new species of, 319. 

 Amphidesma_/?rti''e5<:'en5 Gould, 89. 

 Amphidetus Kurtzil Girard, 213. 

 Anaperus unisemita Stimpson, 8, 46. 

 Annual Meeting for 1851, 56. 



for 1852, 216. 



: for 1853, 336. 



Anodon ciconia Gould, 92. 



Anolius Carolinensis, 221. 



Anomalous balls of grass, 260. 



Anonacea?, 221. 



Anthracite from calciferous Sandstone 



of New York, microscopic characters 



of, 188. 

 Aphides Viviparous, development of, 



380. 

 Ai'auja sericofera, 250. 



Arbacea V Bouve, 3. 



Argryroxyphium Sandvicense, 342. 



Arthemis saccata Gould, 91. 



Ascidia, organs of vision and nervous 



system in embryo of, 30. 

 Asoidia, new species of, 228. 

 Ascidia callosa Stimpson, 228. 



— r tenella "■ 228. 



(jeometrica " 229. 



Avicula sterna Gould, 93. 

 Axius serratus Stimpson, 222. 

 Aztec children, 1. 

 letter on, 2. 



Balsam, capsule of, 106. 



Bdelloura parasitica, 211. 



Beaver-cut wood, from ]\It. Holly, 34. 



Beryl, enormous, 265. 



Bibliography of American Natural His- 

 tory, report of committee on, 386. 



Birds' found both in Europe and Ame- 

 rica, list of, 324. 



Blue fish, 288. 



Bodo, 124. 



Boltenia rub7'a Stimpson, 232. 



Botryodactyla, gen. Ayres, 52. 



economic value of, 100. 



ojfinis, Ayres, 145. 



Botryoidal, fibrous phosphate of lime 

 from Crown Point, analysis of, 47. 



Bouchepon's theory of a change in the 

 earth's axis, 180. 



Brain and Spinal Cord of Frogs, micro- 

 scopic structure of, 107. 



Bufo Americanus, 94. 



Bulla canaliculata, 18. 



pertenuis, 18. 



■■ puncto-striata, 17. 



Buprestidse, peculiarities of generation 

 in, 227. 



Cabbage with forty-three heads, 370, 



Cabinet, donations to. 

 Abbot, S. L. 103. 

 Adams, Edwin, 5. 

 Alger, Francis, 61, 74, 265. 

 American Board of Commissioners of 



Foreign Missions, 209. 

 Anthony, J. G. 121, 241, 254. 

 Atwood, N. E. 136, 



