512 



THE VOYAGE OF H.5I.S. CHALLENGER. 



Rigid balls, 17. 



Rio de la Plata, Hyalonema, 228, 38G. 



Roller-stars, 120. 



Root-tuft, 40. 



Rosettes, 30, 48, 128, 175. 



Rosettifera (Carter), 9, 138. 



Rosselki, Carter, 115, 136, 138, 374. 



antardica. Carter, 138, 139, 374 (PI. Iv.). 

 „ phiUppinengis, 132. 



celata, Wyv. Thomson, 143, 375. 

 RosselliJfe, 129, 374 ; batliymetrical distribution, 456, 

 458 ; geograpliical distribution, 436 ; phylo- 

 geny, 494. 

 Rudiments of rays, 170. 



Sagami Bay, 3 ; AphrocolUstes, 317, 319; Clionelasma, 

 324 ; Eurete, 296, 297, 393 ; Fairea, 277, 278, 

 391 ; Sti/Iocalyx, 214, 383. 

 Santa Cruz, Pheronema, 85 ; Reijadrella, 239, 387. 

 Sarcohexactinellida, 9. 

 Sarco-vitreobexactinellida, 9. 

 Sars, Hyalonema longissimum, 186; Hyalonema 



parvum, 186. 

 Schmidt, 0., 8; Aphrocallistes, 307, 309; Asconema, 

 115; Cyrtaulon, 332; Dactyloealyx, 346, 347; 

 Eiipledella, 62; Fansa, 268; Hertwigia, 109; 

 Holtenia jMurtalesii, 236 ; Hyalonema kentli, 

 207; Hyalonema sieboldii, 188; Lannginella, 

 129 ; Lefroyella, 302 ; Margaritella, 351 ; 

 Mexican Sponges, 15; Phei-onema, 245 ; Pher- 

 onema annse, 238; phylogeny, 488, 497; Re- 

 gadrella, 84; Rhahdodkfyum, 107; Rhahdo- 

 pedella, 108; Sympagella, 119. 

 Schultze, M,, 6 ; Eupledella, 55 ; Hyalonemata, 182 ; 



Lophospongise, 184. 

 Scleroplegma, 0. Schmidt, 350, 404. 



conicum, 0. Schmidt, 351, 404 (PI. ci.). 

 ,, laterna, 16. 



Sderothamnm, Marshall, 337, 401. 

 Sderoihamnus daudi, Marshall, 339 (PI. xcviii.). 

 ScopulK, 34, 48. 

 Seopularia (Carter), 289, 391. 

 Scopulifen-a (Carter), 9. 



Scotland, Aaconema, 372 ; Pheronema, 241, 387. 

 Scyphia, 8. 

 Secondary rays, 30. 

 Semper, 3 ; Eupledella, 55 ; Eureie, 289 ; Hyalonema 



sdiuUzei { = Semperella), 185, 259. 

 Semperella, Gray, 259. 



„ sdiultzei, Semper, 261 (Pis. li., lii.). 



Semperellinse, 259, 389. 



Setubal, Hyalonema, 385. 

 SeycheUe Islands, Eupledella, 366. 

 Shetland Islands, Stylocalyx, 383. 

 Sierra Leone, Malacosaceus, 93, 369. 

 Sieve-plate, 66, 77, 190, 290. 

 Silicea (Bowerbank), 183. 

 Skeletal spicules, 27. 

 Skeleton, 27 ; evolution of, 502. 

 South Atlantic, 440. 

 South Indian Ocean, Balanites, 372. 

 South Pacific, 440; Balhydoriis, 155, 376; Didyo- 

 calyx, 105, 370; Hyalostylus, 371; Stylocalyx, 

 224, 385; Traclujcaulus, 128, 373. 

 South Temperate Zone, distribution, 445. 

 South Tropical Zone, distribution, 447. 

 SoUas, classification, 10 ; Dadylocalyx, 347. 

 Spain, Aphrocallides, 395 ; Sympiagella, 372. 

 Sperms, 24. 

 Sphierohexact, 48. 

 Sphffirohexasters, 31, 48. 

 Spicular sheath, 24. 



Spicules, analysis, 28 ; anchor, 42, 132 ; appendicular, 

 132 ; arrangement, 40, 41 ; axes of, 29 

 birotulate, 193 ; broom-like, 34 ; clasps of, 78 

 comital, 68 ; compass, 80 ; cruciform, 1 86 

 curvature of, 30; extrinsic, 75, 110; flori- 

 como-hexradiate, 59 ; defensive, 71 ; formation, 

 499; lamination, 205; orientation, 502; porrecto 

 multiradiate, 307 ; position, 40, 41 ; raphide- 

 like, 81 ; rationalised, 501 ; spindle-shaped, 

 192; steUate, 109; structure, 27; union, 38. 

 Spongicolffi, Gray, 182. 

 Spongia odancyra, Brandt, 182, 184. 

 „ spinicrux, Brandt, 182, 184. 

 Sponge, dredging, 61. 

 Stalk, 169, 171, 172. 

 Stauradinella, Zittel, 14. 

 Staurodermidse, Zittel, 13. 

 Stauronemata (SoUas), 10, 347. 

 Steere's sponge {Sderothamnus), 337. 

 StephoscypJius mirahilis (commensal), 98. 

 St. Lucia, Eupiledclla, 77. 



St. Thomas, Aphrocallistes, 305 ; Clionelasma, 327 ; 

 Fan-ea, 277, 288 ; Hyalonema, 201 ; Myliusia, 

 405. 

 St. Vincent, Aulocystis, 406. 

 Stutchbury, Dadylocalyx, 342. 

 Stylocalyx, n. subgen. (see Hyalonema), 211, 383. 



„ apertum, n. sp., 214, 383 (Pk. xxxvii., 

 xxxrai.). 



