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. 



Abaotinal System, plates of, 38. 



Abnormal growths, 135, 547. (Pi. IV, figs. 



9-17.) 

 Aoacocriims, 362, 515. 



amerioanus, 516. 



Elrodi, 515. 



Acantliocrinus, 216, 218. 



longispinus, 219. 



Acroormidae, 52, 83, 105, 163, 170, 803. 



Acrocrinus, 86, 485, 804, 805. 



amphora, 806, 808. (PI. LXXX, figs. 



4-9.) 

 Shumardi, 805, 806, 809. (PI. LXXX, 



figs. 1-3.) 



urnceformis, 806. 



Wortheni, 165, 806, 807, 809. (PI. 



LXXX, figs. 10a, b.) 

 Actinal System, plates of, 38, 88. 

 ActinocrinidaB, 79, 86, 165, 170, 550. 

 Actinocrinites, 409, 481, 519. 

 Actinocriniis, 13, 69, 83, 85, 120, 121, 129, 



308, 365, 409, 413, 486, 519, 547, 550, 552, 



554, 578, 586, 601, 626, 720. 



abnormis, 546. 



mgilops, 628. 



'Cequalis, 371. 



cequibrachiatus, 440. 



var. alatus, 441. 



althea, 632. 



amphora, 587. 



amplus, 520, 530. 



andrewsianus, 433. 



araneohts, 581. 



Armoldi, 624. 



arrosus, 577. (PI. LV, figs. 7-8o.) 



Actinoorinus asperrimus, 575. (PI. LX, figs. 

 5, 6.) 



asterias, 558. 



asteriscus, 441. 



biturbinatiis, 427. 



Blairi, 625. 



brevicornis, 533, 535. 



■ brevis, 511. 



Brittsi, 597. 



brontes, 562. 



calyculoides, 895. 



calypso, 483. 



carica, 448 



Caroli, 424. 



Cassedayi, 483. 



■ cauUctdus, 483. 



chloris, 571. 



chouteauensis, 570. (PI. XLVI, flgs. 



lla-b.) 



Christyi Shmn. 409. 



Christyi Hall, 409. 



clarus, 612. 



dio, 393. 



clivosus, 630. 



clcelia, 398. 



clypeatus, 380. 



ccelatus, 618. 



concavus, 482. 



concinnus, 582. 



Copei, 598. 



corbulis, 399. 



corniculus, 511. 



cornigerus Hall, 4.58. 



— cornigerus Lyon, 548. 



— coronatus, 403. 



— Corey i, 510. 



