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. 
Abrachiocrinus, 98. 
Ahracrinus, 42. 
Actinocrinidae, defined by Jaekel, 41. 
Aethocrinus sculptus, 142. 
Agassiz, Louis, i. 
Allocrinus, 30. 
benedicti, 31. 
longidactylus, 30. 
ponderosus, 30. 
typus, 30. 
American Museum Nat. Hist, 7, ii. 
Ampheristocrinus typus, 132. 
Anal structures, modifications of, 41. 
■ tube, 96. 
Angelin, N. P., 9, 41. 
Anisocrinus, 65. 
angelini, 66. 
greenei, 66. 
oswegoensis, 66. 
Anthemocrinus, 14. 
Aorocrinus, 47. 
clarkensis, 47. 
nodosus, 47. 
Arms in Calceocrinidae, 89. 
axil, 90, 94, 125. 
branching of, 112, 125. 
disappearance of, 89, 99. 
lateral, 90. 
median, 89, 90, 95, 125. 
modifications of, 89, 94, 99. 
Asaphocrinus, 66. 
bassleri, 66. 
minor, 67. 
Asymmetry of stem and arms, 89. 
Axil-arm system, 90, 92, 93. 
development, diagram, 94. 
Bainbridge formation, 75, 79. 
Barrandeocrinus, 43. 
Basals, atrophy of, 89. 
fusion of, 90. 
Base, modifications of, 89, 90. 
mobility of crown on, 96. 
Bassler, R. S., 2, 10, ii, 80, 117. 
Bibliographic Index, 10. 
Bather, F. A., 9, 20, 82, 88, 96, 97, 100, 104, 126, 131, 
136, 137. 
Batocrinidae, 41. 
rejected by Jaekel, 41. 
Beachler, Charles S., 6, 9, 10. 
Beech River formation, 3, 6. 
Benedict, A. C., 6, 10, 76. 
Bibliography of author’s works, 146-152. 
Bilateral symmetry, 89, 96, 99. 
Birmingham Museum, 8, 63. 
Blastoidea and Cystidea, 141. 
Bob formation, 2. 
Botryocrinus polyxo, 138. 
tenuidactylus, 137. 
Brachials, 90. 
Brahmacrinus, 53. 
elongatus, 53. 
Braun, Frederick, 6, 7, 10, ii. 
British Museum, 6, ii. 
Brownsport group, 2. 
Calceocrinidae, 71, 88, loi, 104. 
diagram of Forms A, B, C, D, 91. 
■ — — ■ distribution, too. 
evolutionary series, 90, 91, 92, 99. 
genera of, 104. 
mobility of crown on stem, 98. 
mode of life, 98. 
nomenclature, loi. 
orientation of calyx, 88. 
series of, 91. 
shifting of stem, 96. 
tri-radiate form, 92. 
Calceocrinus, loi, 102, 103, 104, 115, 118. 
diagram, 91. 
generic position of, 103. 
alleni, 119. 
bassleri, 100, 117. 
bident at us, 118. 
bifurcatus, 113, 117. 
bradleyi, loi. 
contractus, 118. 
■ foerstei, 94, 100, n6. 
furcillatus, no. 
gotlandicus, 94, 100. 
halli, 103, 1 18. 
interpres, 94, 100. 
nitidus, 100, 113, 119. 
pinnulatus, 94, 95, 100, 113, 116. 
pugil, 100, 1 17, 120. 
ruqosus, no. 
stigmatus, loi, 118. 
tenax, 116. 
tucanus, 100, 117. 
— — typus, loi, 103, 119. 
Callicrinus, 18, 39. 
beachleri, 40. 
spp., 40. 
Calvin, S., 127. 
Calycanthocrinus, 74. 
Calyptocrinidae, 35. 
Camerata, 12. 
Carpenter, P. Herbert, 104. 
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