INDEX TO VOL. XXIII. 



The names of genera and species described as new are italieized. 



Abbott, C. C. Antiquity of man in the 

 valley of the Delaware, 424; notes 

 on Hesperomys leucopus, 305. 



Abraxes grossularia, 284. 



Aconitum, 296. 



Acraspeda, 124. 



Actinaria, 110. 



Actinoceras, 317. 



Actinophrys, 47. 



Actinozoa, 49. 



Aetheria, 540. 



Alcyonaria, 110. 



Amblystoma mavortium, 338. 



Ammonites, 103. 



Amphioxus, 109, 398. 



models illustrating develop- 

 ment of, 306. 



Anarcestes, 403. 



Anemone, 296. 



Anemonella, 293. 



Annual Meeting, May 7, 1884, 180; May, 

 6. 1885. 225; May 5, 1886, 307; May 4, 

 1887. 360. 



Annual Report of Curator, 180, 22G, 307, 

 360. 



Annual Report of Secretary, 190, 235, 

 319, 372. 



Annual Report of Treasurer, 193, 238, 

 322, 375. 



Anodonta, 535. 



Anomia, 539. 



Anthropology, 197, 213, 215, 223, 240, 242, 

 269, 305, 324, 333, 341, 356, 421, 424, 

 436. 



Aplysia, 112. 



Aplysilla sulfurea, 60. 

 riolacea, 99. 



Aplysina verongia, 73. 



Archflooyathus, 317. 



Archispongia, 86. 



Arion, 62. 



Arthropod a. 56. 



Asaphus, 317. 



Ascetta clathrus, 92. 



primordialis, 93. 



Asoidia, 113. 



Ascoceras indianensis, 484. 

 nevvberryi, 484. 



Ascones, 61. 



Ascortis fragilis, 130. 



Asculmis armata, 92. 



Asterias, 55. 



Atlantosanrus, 337. 



Atrasrene, 296. 



Atwood, N. E. Account of the life of, 337. 



Atypus viversi, 337. , 



Aiilacoceras, 112. 



Avicula, 539. 



Baculites, 407. 



Baird, Spencer F. Sketch of the life of, 

 558. 



Barton, G. H. See Crosby, W. O., and 

 Barton, G. H. 



Basilarchia, 408. 



Beatricea, 213. 



Belemnites, 112. 



Belostoma, 336. 



Bermudas, origin of the present form of 

 the, 518. 



Binney, Amos. Gift of his library from 

 his son, 224. 



Birds, epidermal system of, 358. 



Black Hills of Dakota, geology of, 488. 



Blattina insignis, 356. 



Boltenia, 390. 



Boston basin, geology of, 7, 29, 223. 



Boston harbor, geology of outer islands 

 of, 450. 



Boston Society of Natural History, col- 

 lection of lichens of, 274. 



Botany, 274,293. 



Bouvifc, T. T. Genesis of the Boston 

 basin and its rock formation, 29; 

 notes on gems, 2; remarks on the 

 geology of Boston basin, 232. 



Bow and arrow unknown to palaeolithic 

 man. 269. 



Brachystoma, 269. 



Brooks, Henry. Preliminary remarks 

 on the structure of the siphon and 

 funni'l of Nautilus pompilius, 380. 



Calathium. 317. 



Calcispongia, 78. 



Caltha, 296. 



Cameraphysema, 92. 



Campanularidae. 116. 



Campbell, D. H., award to, of Walker 



Prize for 1886, 321. 

 Campylorhyncus balteatus, 384. 



bicolor, 383. 



brevirostris. 384. 



brunneicapillus, 383. 



curvirostris, 385. 



megalopterus, 385. 



minor. 386. 



nuchalis, 386. 



pallescens. 384. 



palliceps. 384. 



pardus, 386. 



unicoloroides, 383. 



zonatoides, 384. 

 Carchesium. 136. 

 Cardium, 535. 

 Carneospongia?, 72. 



(567) 



