REPORT ON THE HEXACTINELLIDA. 



513 



Sfylocalyx davigerum, ii. sp., 220, 384 (PI. xli.). 



,, depressum, n. sp., 217, 383 (PLs. xxxv., 

 xxsvi.). 

 elegans, n. sp., 223, 384 (PI. xxx.). 

 globus, n. sp., 221, 384 (PI. xl.). 

 tenemm, n. sp., 224, 385 (PI. xxxi.). 

 „ thomsoni, Marshall, 211, 383 (PI. xxxiv.). 

 Superimposed individuals, 62. 

 Superior funnel, 171. 

 Subdermal trabecular space, 19. 



„ trabeculfe, 47. 



Subgastral trabecular space, 1 9. 



„ trabeculse, 47. 

 Survey of genera and species, 365. 

 Siiss, Hyalonema parallel um, 183. 

 Sympagella, O. Schmidt, 119, 372. 



nuj:, O. Schmidt, 120, 372 (PI. xxii.). 

 SympageUinse, 119, 372. 

 Synapticula, 28, 38, 172. 

 Synauloidffi, 10, 39, 487. 

 Syrim/idium (0. Schmidt), 15, 302. 



ziftelii (O. Schmidt), 347. 

 Txgeria, n. gen., 94, 369. 



„ piidchra, n. sp., 94, 369 (Pis. vii., viii., xi.). 

 Tregerina, 94, 369. 

 Tahiti, Didyocalyx, 105. 

 "Talisman," 17. 

 Terminal rays, 47, 172, &c. 

 Terminal sieve-plate, 21, 47. 

 Tetilla polyura, 132. 

 Tetractinellida, 496. 

 Tetracts, 35. 



Thomson, Wyville, 7; Aphrocallistes, 306; Asconema, 

 115; Corbitella, 101; Eupledella, 60; Farrea, 

 268; Habfodidyum, 101; Heterotella, 101; 

 Holtenia, 186, 235; Hyalonema, 186, 201; 

 Lefroyellci, 301 ; Pheronema, 241 ; Polio- 

 pogon, 254; Rossella, 137, 144. 

 Timor, Myliusia, 405; Sde.rofhamnus, 339, 402. 

 Tissue, 23 ; flake-like, 69. 

 Tradiycaulus, n. gen., 128, 373. 



gurlitti, n. sp., 128, 373 (PI. xxvi.). 

 " Travailleur," 17. 



Tretodictyidae, 327, 398; distribution, 438. 

 Tretodidyum = Hej-adinella, 328. 



„ ryathus ( = Hexadinella ventilabrum), 328. 



,, latum { = Hexadinella lata), 327. 



Treiodidywn tubulositm ( = Hexadinella tubulosa), 

 328. 



Triads, 35. 



Triaxonia ( = Hexactinellida), 51. 



TridiapteUa elegans, 17. 



Tristan da Cunha, Caulocalyx, 172, 319 ; Farrea, 288; 

 Hyalonema, 232. 



Tropical Zone, distribution, 445. 



Tuhuliiia, Carter, 9. 



Umbels, 36. 



Umbelluluria grmnlandica, 352. 



Uncinata, 37, 48. 



Uncinataria, 266 ; bathymetrical distribution, 457, 

 458. 



Vphantsenia daicsoni, 63. 



Valenciennes, Hyalonema, 181. 



Vaxella ( = Holtenia saccus), 237. 



Ventriculites, 8. 



Ventriculitidoe, 13. 



Verticils, double, 207. 



Vitrea, 7. 



Vitreo-hexactinellida, 9. 



Vitreous fibre, 27. 



Volvidina, 0. Schmidt ( = Cyrtaulon), 332. 

 „ sigsbeei, 16. 



Vosmaer, 3. 



Walcott, fossil EuplecteUid, 63. 



Walferia, n. gen., 96, 369. 



„ Hemmingii, n. sp., 96, 369 (Pis. ix., x., 

 xi.). 



"Weltner, Ajjhrocallistes, 310; fossil forms, 16. 



West Hebrides, Hyalonema, 213, 382. 



West Indies, Aulocystis, 406; DadyJocalyx, 403; 

 Myliusia, 405 ; Sderoplegma, 401. 



Witefield, R. P., fossil EuplecteUid, 63. 



Willemoes Suhm, Eupledella, 61. 



Wright, Perceval, Aphrocallistes bocagei, 306; Hyalo- 

 nema mirabiles, 186. 



Young forms, Poliopogon, 256. 



Young, M. and I., fossil Hyalonema, 188. 



Zebu, Crateromorplia, 161, 378 ; Eupledella, 366 

 Euplectella aspergillum, 72; Etivete, 298 

 Hyalonema, 385 ; Plieronema, 246, 387 

 Polylophus, 133; Sclerotkammis, 337; Sem- 

 per ella, 261. 



Zittel, Aphrocallistes, 309, 310; classification, 11: 

 Dadylocalyx, 347; phylogeny, 491. 



