436 THE VOYAGE OF H.M.S. CHALLENGER. 
Hyocrinus continned— 
oral plates of, 70, 72, 94, 95, 156, 219; 
pinnules of, 59-61, 219, 224; side plates 
of, 82, 220; stem of, 5, 31, 32, 218, 221; 
systematic position of, 222-224; testes of, 
220; water-pores of, 94, 95, 219, 220, 
bethellianus, 218-222, 240, 376, 378, 386, | 
389, 391 (Pl. ve. figs. 4-18; Pl. vi.). 
Hyponome sarsi, 67, 85, 166. 
Hypozygal, 4, 50, 54. 
Ichthyocrinide, 42, 76, 149, 155, 166, 181-185, 195. 
Ichthyocrinus, 185, 195. 
Ilyaster, 401. 
Ilycrinus, 225. 
Inarticulata, 145. 
Metacrinus, 10, 138, 110, 124 
Infra-nodal joint, 13. 
. Interarticular pores, 18. 
Internal casts of Actinocrinidew, 165, 174, 179, 182 ; of 
Platycrinus, 179. | 
Interpalmar areas of disk, 69, 81, 84, 165, 166, 174, 180. | 
Tnterradials of calyx, 38-46, 74, 162, 178, 371. 
Interradials of perisome, 42-44, 73, 74, 76, 183, 371. 
Intervisceral blood-vessels, 87, 97-105, 405, 406. 
Tntervisceral coelom, 67, 109. 
Intervisceral plexus, 86, 87. | 
Intra-radial commissure of Comatula and Pentacrinus, 
125, 126; of Bathycrinus, 127, 229 ; of Rhizo- | 
crinus, 126, 253. 
Tocrinus, 46, 363. 
Isis, 272, 300, 302. 
Tsocrinus, 271-273, 281. 
pendulus, 34, 284. 
Labial plexus, 93, 97-101, 103-105, 404-406. 
Lecanocrinus reemeri, 217. 
Lepidodiscus, 85. 
Lichenocrinoidea, 192. 
Lichenocrinus, 192. 
; dubius, 20. 
Ligaments, of arms, 7-9, 414 ; basiradial ligaments of 
Bathyerinus, 228 ; of stem, 5-7, 13, 23. 
Madreporie canal of Echinozoa, 106, 194, 406. 
Mariacrinus, 155, 171. 
Marsupiocrinus, vault of, 171, 175-177 
depressus, 176. 
radiatus, 176. 
Marsupites, 34, 48, 68, 132, 142, 145, 151, 155, 181, 
183, 196, 216, 394-398. 
Marsupitide, 142. 
Megistocrinus, 54. 
Mesocrinus, 24, 237, 255-257, 323. 
, 128, 134, 148, 152, 154, 
205, 270-272, 275, 283, 285-288, 291, 
300, 304, 311, 320, 334, 336, 339, 
840, 341-344, 357, 359, 360, 362, 369, 
370, 387, 388-391; arms of, 55, 285, 
286, 342; cirri of, 288, 342; disk of, 
59, 68, 80, 81, 93, 342; geographical 
and bathymetrical distribution of, 136- 
142, 343; pinnules of, 10, 55, 58, 155,- 
341, 342; pinnule-ambulacra of, 81, 
82; radials of, 48-51, 341, 357; stem 
of, 14, 15, 17, 19, 287, 288, 342, 343. 
angulatus, 19, 51, 60, 70, 80, 81, 110, 
134, 287, 288, 293, 342, 344, 345, 
346, 348, 355, 357, 364, 366, 369, 
370, 377, 387, 389 (Pl. xii. figs. 1-14; 
Pls. xxxviii., xxxix.). 
cingulatus, 17, 80, 81,.287, 288, 342, 
344, 346, 347, 348, 355, 357, 358, 
369, 377, 387, 389 (Pl. xl.; Pl xii. 
figs, 14), 
costatus, 17, 35, 82, 129, 284, 288, 342, 
344, 359, 360-362, 363-366, 368— 
370, 378, 387, 389 (PL xlvii. fig. 13 ; 
Pl. xlix.). 
Metacrinus dredged by the “ Vega,” 340, 
343, 344, 368, 387, 388. 
interruptus, 134, 288, 342-344, 867, 
868, 369, 377, 387, 388 (Pl. lii.). 
moseleyi, 17, 129, 341, 344, 855, 356, 
357-359, 378, 387, 389 (Pls. xlv., 
xlvi.). ; 
murrayt, 17, 78, 81, 82, 128, 140, 184, 
326, 342-344, 349, 350, 351, 352, 
355, 377, 378, 387, 389 (Pl. xli. 
figs. 12-17; Pl. xlii.). 
nobilis, 17, 80-82, 287, 344, 350, 851, 
352, 353, 355, 369, 377, 387, 389 
(Pl. xli. figs. 5-11; Pl. xiiii.). 
nodosus, 51, 76, 80-82, 289-291, 342, 
344, 359, 362, 364, 365, 366, 368— 
370, 377, 387, 389, 391 (Pis. 1, li). 
rotundus, 343, 344, 357, 387, 388. 
stewarti, 288, 344, 387. 
superbus, 344, 351, 352, 355, 387. 
tuberosus, 134, 288, 342, 344, 869, 870, 
377, 387, 389 (Pl. liii. figs. 1-6). 
varians, 17, 129, 134, 288, 342, 344, 
351, 352, 358, 354, 355, 366, 378, 387, 
389 (Pl. xliv.; Pl. xlvii, figs. 6-12). 
