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824 GENERAL INDEX. 
Dichocrinus pisum, 763. (Pl. LX XVI, fig. 5;|Dizygocrinus facetus, 418. (Pl. XXXIII, 
LXXVIL, fig. 10.) 
plicatus, 758. (Pl. LX XVII, figs. 5a, b.) 
pocillum, 767. 
figs. la, b.) 
radiatus, 754. 
—— scitulus, 767, 772. (Pl. LX XVIII, figs. 
13a-14.) 
sculptus (Lyon and Cass.), 762. 
-—— sexlobatus, 754, 784. 
stmplex, 790. 
—— striatus, 757. (Pl. LX XVII, figs. 11a, b.) 
subspinulosus, 754. 
—— superstes, 766. (Pl. LX XVI, fig. 12.) 
symmetricus, 786. 
Ulrichi, 772. 
Dicycelic, 33. 
Dicyclic Crinoids, 54, 58, 60, 67. 
Dicychiea~ a9, lo71, 16d. 
Dimerocrinus, 189, 190. 
aptilis, 192. 
decadactylus, 191. 
-— icosidactylus, 191. 
— liliiformis, 192. 
oligoptilis, 192. 
waldronensis, 192. 
Discoideus group, 710, 713. 
Disk, 29, 35, 105. 
Disk ambulacra, 35, 154. 
Discoveries of specimens, 19. 
Distal, 37. 
Distichals (Distichalia), 15, 34, 71, 78, 97, 
100, 108. 
Distribution, geological and geographical, 171, 
188, 265, 863, 551, 648, 742, 808. 
Dizygocrinus, 362, 3867, 374, 413. 
andrewsianus, 433. (Pl. XXIX, figs. 
2a—d.) 
biturbinatus, 427, 430. (Pl. XXXIII, 
tion 9) 
-cantonensis, 423. (Pl. XXXIII, figs. 
8a, b.) 
crawfordsvillensis, 417. 
—— decoris, 420. (Pl. XXXV, fig. 6.) 
—— dodecadactylus, 432. (Pl. XXIX, fies. 
la-c.) 
euconus, 413, 480. (Pl. XXXV, figs. 
7a, b.) 
var. abscissus, 431. (Pl. XLVI, 
nae) 
to) 
fig. 12.) 
Gorbyi, 426. 
—— Gurleyi, 422. (Pl. XXXIV, fig. 19.) 
polydactylus, 103, 756. (Pl. LX XVII, | —— indianensis, 413, 415, 417. (Pl. XX XIII, 
figs. 6a, b; XXXYV, fig. 5.) 
: var. simplex, 416. (Pl. XXXIII, 
fig. 7.) 
—— montgomeryensis, 428. (Pl. XXXIII, 
figs. 8, 4; XLVI, fig. 10.) 
var. unibrachiatus, 429. Gel: 
XXXII, figs. 5a-c.) 
—— mutabilis, 414, 429. (Pl. XXXV, figs. 
8, 9, 10, 11.) 
originarius, 414, 421. (Pl XXXIII, 
figs. la, b; XXXV, figs. 14, 15.) 
var. adultus, 414, 422. 
rotundus, 431, 432. (Pl. XXIX, figs. 
da—4.) 
—— unionensis, 424. (Pl. XXXV, figs. 16- 
20.) 
var. divalis, 425. (Pl. XXXV, 
figs. 21-24.) 
Whitei, 419, 421. (Pl. XXXIII, figs. 
10a, b, 11.) 
didactylus, 420. (Pl. XXXV, figs. 
is, 
Dolatocrinites, 264, 304. 
Dolatocrinus, 77, 122, 124, 265, 307, 310, 311. 
—— canadensis, 315. (Pl. XXV, figs. 7a, b.) 
—— excavatus, 321. (Pl. XXV, fig. 1; 
XXVI, figs. 7, 8.) 
glyptus, 317, 318. (Pl. XXVI, figs. 
2a, b.) 
icosidactylus, 319. (Pl. XXVI, figs. 
da-d. ) | 
lacus, 311. (Pl. XXVI, figs. 6a-c.) 
—— liratus, 319. (Pl XXVI, fig. 3.) 
var. multihra, 319. 
—— Lyoni, 314. (Pl. XXV, figs. 6a-d.) 
—— major, 322. (Pl. XXV, fig. 5.) 
—— Marshi, 312. (Pl. XXVI, fig. la-d.) 
var. hamiltonensis, 314. (Pl. XXV, 
figs. 2a, b.) | 
ornatus, 317. 
—— Sspeciosus, 323. (Pl. XXV, figs. 4a, b.) 
triadactylus, 316. (Pl. XXVI, figs. 
4a—d.) 
tuberculatus, 324. (Pl. XXV, fig. 3.) 
Dorsal cup, 33, 150. 
Dorsocentral, 33, 49, 51. 
