GENERAL INDEX 



The names of Genera, Species, and larger divisions considered to be valid are printed in bold-face 

 type; those regarded as synonyms, in italics. The bold-face figures indicate the page at which the genus, 

 species, or term is defined. 



Abactinal system, 26, 27. 



Abnormalities, 133, 179, 185, 352, 365, 366, 386, 402, 

 435- (PL II). 



4 rays, 366. (PL XLIX, figs. ya-e). 



6 rays, 48, 60, 402, 435. (Pis. LVII, figs, ua-c; 



LXXII, fig. 12). 



7 rays, 386. (PL LII, figs. Sa-d). 



Acknowledgments, 16-18. 



Actinal system, 26, 48. 

 Actinocrinidae, yy. 

 Actinocrinites, 216. 



cxpansus, 215, 216, 217, 218, 384. 



Actinocrinus concavus, 317. 

 Actinometra, larval stage, 61, 79, 81, 85. 

 " Actinometra stage," 81, 87. 

 Adambulacra or side-pieces, 21. 

 Agaricocrinus, unequal rays, 171, 172. ■ 

 Agassiz, A., 6, 17, 79. 



Agassiz, Louis, 17. 



Ambulacra, 22, 235, 390, 429, 449. Expl. PL XXIV. 

 Ambulacrals (Amb.), 21, 22, 50. 

 American and European faunas, 96. 

 American Mus. Nat. Hist., 7, 8, 17, 289. 

 Amphicrinus, 24, 29, 32, 39, 41, 66, 314, 319, 337- 

 338. (Text-fig. 45). 



anal interradius smallest, 337. 



■ degenerate tendency of anal, 338. 



infrabasals, atrophy, 337, 339, 340. 



carbonarius, 341. (PL LX, figs. 12a, b). 



scoticus, 24, 338. (PL XL, figs. 90-116). 



Anal plates, 21, 68-72. 



Anal structures, 21, 56, 61-65, 72, y6, 80-82, 112, 

 262. 



asymmetry, 63, 65, 70. 



■ ■ malformation in Amphicrinus, 34D. 



in Recent crinoids, 60, 68, 70, 87. 



strong and weak, 112-116, 23s, 236, 335, 408. 



Anal tube, 22, 50, 51, 61-63,115, 236, 334, 363, 365, 

 374, 390, 427. (Text-figs. 8, 28c; Pis. LXVI, 

 fig. 2; LXVII, figs. 4, 5, 6). 



■ in larval stages, 80-82. 



Anal x, 21, 40, 57, 71, 86, 114, 340. 



Anchylosis, 23, 38. 



Angelin, N. P., 3, 109, 127, 145, 147, 266, 274, 279, 



294, 297, 379- 

 Anisocrinus, 53, 64, 126, 160-162. (Text-fig. 15). 



■ the species of, 162. 



■ angelini, 129, 163. (PL X, figs. 40, 6). 



greenei, 163. (PL X, figs. 8, 9). 



interradiatus, 162. (PL X, figs. la-^b). 



■ irregularis, 165. (PL X, figs. 50-6). 



oswegoensis, 164. (PL X, figs. ya-c). 



Anus (As), 22, 51, 6y. 



Antedon, infrabasals, 39. 



larval stages, 22, 48, 60, 62, 64, 68, 69, 72, 79. 



82, 87. (PL A, figs. 1-6). 



bifida, 80. 



" Antedon stage," 82, 85, 87. 

 Apiocrinidae, stem in, 28. 



■ differ from Flexibilia, 92. 



Apiocrinus, 446. 

 Arachnocrinus, 36, 47. 



arms of, 47. 



canadensis, 182, 189. 



■ pisiformis, 135, 136. 



Arcuate sutures, 26, 43-45, 112, 239, 242, 252, 271, 



290,402,407,434. (Text-figs. 6, y). 

 Aristocrinus, 304, 306. 



concavus, 309. 



Arm plates (see Brachials). 

 Arms, 20, 45-48, 61, yy, 152. 



autotomy, 403. 



begin with first brachial. 43. 



coiling, 47. (PL XVIII). 



■ composition, 47. 



■ dextrorse twist, 191, 194. 



■ dichotomous, 20, 45, yz. 



heterotomous, 20, 46, 73, yy, 304, 360, 418, 419, 



423; 



interradial, 47. 



in Promachocrinus, 48. 



in Thaumatocrinus, 47. 



multibrachiate, 45. 



relative size, 47. 



unequal, 20, 46, 171. 



uniserial or biserial, 20, 45. 



Arthracantha, yy. 

 Articulata, 105, 106, 107, 267. 

 ■ characters, 106-108. 



Articulations, 23, 26, 42, 43, 107, 232. (PL XXIV). 



Articulosa, no. 



Artists, 3, 15. 



Asaphocrinus, 174-175, 354. (Text-fig. 18). 



the species of, 175. 



bassleri, 178. (PL X, figs. 100-14). 



excavatus, 177. (PL IV, figs. 23-29). 



incisus, 178. (PL IV, fig. 30). 



ornatus, 176. (PL IV, figs, ia-22). 



Asymmetry, 63, 191, 195, 285. 



Atrophy of infrabasals, 31, 119, 120, 262, 269, 277, 



289, 315, 337, 339, 340. 

 Austin, G. W., 17. 

 Austin, Thomas, Sr., and Thomas, Jr., 3, 108, 216, 



379, 454- 

 Autotomy, casting off arms, 403. 

 Axial canal, 20, 22, 32, 34, 107, 241, 252, 269, 277, 



324,339,340. (Pl.LXXVI. Expl. figs. 150, b). 



■ in arms, 22. 



Axial nerve cords, 22, 32, 24, 35-39. (PL XXX). 

 Axillary brachials (Ax), 21. 



473 



