GENERAL INDEX. 



The figures in dark type indicate the page on which the genus or species is first described. 



The names of geuera and species which are regarded as synonyms or as invalid are distinguished by an 

 asterisk (*). 



Abactinal system, 71. 



Acutirotremites, 7, 88, 91, 123, 125, 127, 133, 13(5, 

 147, 1S9, 200, 220, 234-237. 

 Basals of, 12; deltoids of, 105, 108, 

 109, 111; hydrospires of, 88, 93; 

 lancet-plate of, 55, 03, 108, 109 ; side 

 plates of, 55, 93 ; spiracles of, 100, 

 L05, L08 111, 234. 

 elliptic™, 141, 158, 235, 230 (PL XIII. 

 figs. 17-19). 

 Actinoerinida?, 71, 72. 

 Aetinocrinus, 114, 125,285. 

 Actinoidea, 114. 

 Actinozoa, 115. 

 Agassizocrinus, 10. 

 Allagecrinus, summit of, 72, 74. 

 Ambulacra, 2, 5-8, 11, 13, 22 24, 37; 56-58, 60-65, 

 7:i, 74, 82, 109, 110, 122, 262, 290 ; of Acen- 

 trolnmitcs. oo : of Axtrocfimis, 290, 299,302; 

 of Codaster, 22. 23, 42. 55, 50, 61, 262 ; of Cri- 

 noidea, 22, 27, 28, 05, 82 ; oWryptoblastus. 55 ; 

 of Cryptosehisma, 12. 5(1, 89 ; of Cystidea, 56 ; of 

 Echinoidea, 27, 42; of Elaacrmus, 42, 214; of 

 Eleutherocrinii.s, 26, 295; of Qranatocrinus, 42, 

 55, 56, 242 ; of Mesoblastus, 42, 55 ; of Oro- 

 phocrinus, 55, 61, 90, 91, 98, 99, 280; of Pen- 

 tremitts, 27, 28, 4' '-4:!. 55-65, '.'3-95; of Pen- 

 tremitidea, 25, 27, 55; of Pentephyllum, 122, 

 296; of Phmnoscliisma, 24,55,89, 272; ofiSc&tao- 

 blastus, 42, 93, 95; of Stephanocrimu, 20, 42; 

 of Tric(elocrinus, 25 ; of Troostocrinus, 25, 

 27. 

 Ambulacral canals. See Water-vessels. 



Ambulacral groove. See Ambulacra and Food-groove. 



Ambulacral opening, 44, 47, 51, 52, 153, 164. 



Ambulacral pores, 120. See Hydrospire-pores. 



America, Blastoidea of, 129, 131-139, 142-145. 



Anal opening, 78, 79, 81, 100-102, 106, 109-111 . 



Anal plate of Ekcacrinus, 12, 36, 38, 41, 125, 215. 



Anthodiata, 115. 



Anthozoa, 115. 



Apical dome-plates. See Summit-plates. 



d'Archiac, E. J. A., and Verneuil, E. de. 17i'. 281, 

 283. 



Arthroacaniha Itluicensis, 302. 



Asterial Fossil, 1, 157, 100. 



Asterohlastus, 120. 



Astrocrinidce, 11, 14, 26, 122, 147. 296, 297. 



*Astrocrinites, 263, 270, i".'7, 298. 



Astroerinus, 7,9-11,13,15,22,26,87, 119. 121, 133, 

 147, 148, 152, 294, 296, 297-3i">. 

 Ambulacra of, 296, 299, .".02; basals of, 

 22,296; calyx of, 11, 299, 302; del- 

 toids of, 32, 299; hydrospires of, B7; 

 radials of, 26, 90, 296, 297. 

 Benniei, 141,279, 300,301, 302 (PI. XIX. 



fig. 1 ; PI. XX. figs. 3-20). 

 tetragonus, 141, 300-302 (PI. XX. figs. 1. 

 2)'. 



Austin, T. and T., 2, 185, 186, 239,243,250,263, 

 269, 270, 296-298, 300. 



Baily, W. II., 228, 202, 294. 



Barris. \V. 11.. 7, 36, 132. L69, 213-LI15. HI-. 



P.arrois. (.'., 17:5. 283, 



Baryeriwts, 19 r 



Basal cup, 9, 12, 15, 16, 21. 



