GENERAL INDEX. 



317 



Nudeoblastidffl, 111, I- I. 127, I 16, L97, 209, 210. 

 •HuoUoerinus, 2, 7:;, L21, 209-213, 229, 230. Sco 



/.',' acrinus. 

 Ocular plates of Echini, 22, 25, 27. 

 CEhlert, 1)., 130, 197, 20] 203. 

 (Esophageal ring, 45, 46, 51-54, 80, 101, L54. 

 *Olivanit6g, 2, 125, 210, 212. Sec Ekmerinm. 0. glo- 



bosus, 217, -1 9. 

 Ophioglypha minuta, 38. 

 Ophiomusium granosum, 38. 



Iitmirc, 37. 



valid urn, ;; s . 

 Ophiura, S4. 

 Ophiurids, mouth-shields of, 37, 3S j genital bursa) of, 



80, 83, 84. 

 Oral crest, 23, 32, 33, 88, 111. 



Oral plates, 10, 28, 30, 38, 72-74 ; of Neocrinoidea, 10, 

 23, 37, 65, 72-74 ; of Palceostoma, 74 ; of Psolus, 

 74. 

 Oral ridge, 31, 32, 104, 262, 263. 

 Oral ring. See Oesophageal ring. 

 d'Orbigny, A., 3, 115, 12.3, 149, 109, 172, 216, 2S0, 



281, 286, 2! 12. 

 *Orbitremites, 238, 239. 



*angulalus, 1S5. 

 *Derbiensis, 250. 

 *globosus, 243. 

 Orocentral plate, 71-75. 



Orophocrinus, 4-9, 11, 50, 55, 62, 63, 87, 94, 105, 

 111, 113, 121, 123, 125, 127, 133- 

 136, 147, 149, 164, 170, 171, 176, 

 181, 197, 215, 235, 242, 258, 264, 

 272. 280, 283-2-7, 289, 291. 

 Ambulacra of, 55, 61, 90, 91, 98, 99, 

 286 : basals of, 12, 16, 19 ; calyx of, 11 ; 

 covering-plates of, 63, 64 ; deltoids of, 

 25, 29, 35, 286 ; hydrospires of, 87, 

 90,91, 97, 287; lancet-plates of, 46- 

 48, 51, 55, 99, 286; radials of, 25 ; 

 side plates of, 55, 56, 61, 99, 286 ; 

 spiracles of, 84, 97-100, 110, 284, 

 2S5 ; summit plates of, 63, 64, 68-70, 

 74 ; under lancet-plates of, 47, 48, 50, 

 91, 97. 

 gracilis, 97-99, 143, 286, 287, 2S9 (PI. 

 XVIII. fig. 9). 

 •inflates, 290. 

 Orbignyanus, 50, 57, 62, 90, 91, 93, 99, 

 123,127, 141, 2S5 287(PL XI. fig. 10; 

 PI. XIV. figs. 16-18). 

 pentangularis, 47, 48, 50, 90, 91, 93, 97, 



L20, 127, Ml, 170, 177, 286, 287, 

 289 291, 292, 293 (PI. XV. fig 

 PI. \\ I. figs. B,9j P1.XVTL I 



Orophocrinits pralongut, 111. 287, 294. 



Puzos, 16, 90, L23, 127, 111, 2S5. 287 



(PI. XIV. figs. 11, i:, i. 

 ttelliformis, 9, L9, 20, 47,48,63, 64 

 69, 71, 91, 98, 99, L03, L06-109, 126, 

 I I::, L81, 235, 284-286, 287-289, 291, 

 293 (PL XI. figs. 8, 9; PI. XV. figs. 

 11-15; PL XVI. figs. 5-7; PLXVH. 

 tig. 12). 

 var. campanulatus, 20, 143, 289 

 < PL XVI. fig. 5). 

 vents, 44, 47, 61, 00, 91, 93, 94, 97- 

 li in, 110, 126, 131, 141, 170, 181, 

 257, 278, 285, 2S9, 290, 291, 293 

 (PI. XII. fig. 9 ; PI. XIII. fig. 16 : 

 PI. XV. figs. 1-4 ; PI. XVI. fig. 10 : 

 PI. XVII. fig. 13). 

 * WaU rhoutianus, 292. 

 Outer side plates, 56, 57, 61, 62,86,87; of Granalo- 

 erinus, 62, 2 12: of Maoblaslus, 62 ; of Pentre- 

 mites, 57, 62; of Pentremitidea, 02; of Phceno- 

 schisma, 62; of Schizoblastus, 62. 

 Ovarian openings, See Spiracles. 

 Ovarian pores of Garyocri/aus, OS ; of Pentremiles, 68. 

 Ovarian tubes, 70, S2, 85, 86. 

 Owen, D. D., 167. 

 Owen, D. D., and Shumard, B. P., 2-4. 66, 152. 15(1. 



157, 207, 22:i, 2:i2. 239, 215. 246, 2-7. 

 PahcocrLuoidca, 79, SO, 82; summit-plates of, 71- 



74. 

 Palaostoma, oral plates of, 74. 

 Parkinson, J., 1, 113, 157, 160. 

 Pelmatozoa, 4, 74, 114-110, 117-119. 

 Pentacrinida\ 115. 

 Pentacrinus, 13, 18, 81. 



Naresianus, 21. 

 *Penlatrematites, 101. Sec Pentremites. 

 *gracilis, 139, 171, 181. 

 *gramdai.ns, 144. 

 Hnflata, 131, 141. 

 *oblo»ga, 140. 



na, L39, 171, 181. 



*/'< n/iltiriili/i s. Scr /'. iilrt hiilty. 



PentephyUum, 9, 87, L19, 121. 122, 133, 136, 117. 

 148, 294, 296, 297. 



Basals of, 18, 296 ; deltoids of, 296. 

 adarense, 141, 296 (PL XVI. figs. 14- 

 16). 



