GENERAL INDEX. 
The names of Genera and Species considered to be valid are printed in boldfaced type; those in 
Italics are regarded as Synonyms. Terms not used by us are also in Italics. The bolder faced 
figures indicate the page at which the genus, species, or term is defined. 
Abacocrinus, 363. 
Abactinal System, plates of, 38. 
Abnormal growths, 1385, 547. (Pl. IV, figs. 
9-17.) 
Acacocrinus, 362, 515. 
—— americanus, 516. 
Elrodi, 515. 
Acanthocrinus, (216, 218. 
longispinus, 219. . 
Acrocrinide, 52, 83, 105, 163, 170, 803. 
Acrocrinus, 86, 485, 804, 805. 
——amphora, 806, 808. (PI. LXXX, figs. 
4—9.) 
Shumardi, 805, 806, 809. (Pl. LXXX, 
figs. 1-3.) 
urneformis, 806. 
— Wortheni, 165, 806, 807, 809. (Pl. 
LXXX, figs. 10a, b.) 
Actinal System, plates of, 38, 88. 
Actinocrinide, 79, 86, 165, 170, 550. 
Actinocrinites, 409, 481, 519. 
Actinocrinus, 13, 69, 83, 85, 120, 121, 129, 
308, 865, 409, 413, 486, 519, 547, 550, 552, 
554, 578, 586, 601, 626, 720. 
abnormis, 546. 
cegilops, 628. 
— cequalis, 371. 
ceequibrachiatus, 440. 
var. alatus, 441. 
althea, 682. 
amphora, 587. 
anyplus, 520, 580. 
andrewsianus, 433. 
araneolus, 581. 
—— Arnoldi, 624. 
—— arrosus, 577. (Pl. LV, figs. 7-8c.) 
Actinocrinus asperrimus, 575. (PI. LX, figs. 
5, 6.) 
asterias, 558. 
asteriscus, 441. 
biturbinatus, 427. 
— BHlairi, 625. 
— brevicornis, 533, 535. 
— brevis, 511. 
— Britisi, 597. 
— brontes, 562. 
— calyculoides, 395. 
— calypso, 483. 
—— carica, 448 
— Caroli, 424. 
— Cassedayi, 483. 
cauliculus, 483. 
chloris, 571. 
— chouteauensis, 570. (Pl. XLVI, figs. 
11a-b.) / 
— Christyi Shum. 409. 
— Christyt Hall, 409. 
— clarus, 612. 
— clio, 393. 
—— clivosus, 6380. 
—— clelia, 398. 
— clypeatus, 380. 
— celatus, 618. 
— concavus, 482. 
—— concinnus, 582. 
—— Copei, 598. 
— corbulis, 399. 
— corniculus, 511. 
—— cornigerus Hall, 458. 
— cornigerus Lyon, 548. 
— coronatus, 403. 
— Corey, 510. 
a 
