REPOET ON THE HEXACTINELLIDA. 



511 



Ova, 24. 



Owen, Eupledella, 53 ; Eiipledella cummer, 266 ; 



Farrea, 267. 

 Oxyhexacts, 30, 31, 48. 

 Oxyliexasters, 48. 

 Pttchastrella ahyssi, 115. 

 Pachaulidiwn (0. Schmidt), 15. 

 Palxomanon, 18. 



Pahjthoa, 183, 189, 190, 203, 211, 214. 

 Parenchymalia, 45, 49. 

 Parietal gaps, 47. 

 Pathological modifications, 170. 

 Patulina (Carter), 9. 

 PearsaU, T. J., 181. 

 Penguin Island, Bathi/dorus, 153, 376; CJionelasma, 



327; Stylocalyx, 200, 384. 

 Pentacts, 33. 

 Periphragella, Marshall, 299, 394. 



elisx, Marshall, 174, 299, 394 (Pis. 

 Ixxx., Ixxxi.). 

 Perrier, E. (bathymetrical distribution), 454. 

 Phalcellia ventilahrum, Bwk., 328. 

 Pheronema, Leidy, 234, 239, 386. 



an9ix, Leidy, 239, 386 (PL xlii.). 

 „ carpenteri (Wyv. Thomson), 241, 387 



(PI. xliii.). 

 „ giganteum, n. sp., 250, 388 (Pis. xlv., 



xlvi.). 

 „ glohosum, n. sp., 248, 387 (PI. xliv.). 



grayi, Sav. Kent, 236, 246, 387. 

 „ hemispheericum (Gray), 246, 249, 387. 



„ parfaiti, 17. 



Pheroneniadse (Gray), 237. 



PhiUppine Islands, Aplirocallistes, 319, 396; Aulocystis, 

 406; Crateromorpha, 161; Eupledella, 64; 

 Eurete, 293, 392; Farrea,, 277; Holascus, 90, 

 368; Hyalonema, 196, 382; Polylophus, 133; 

 Sderofliamnus, 402; Semperella, 261. 

 Phylogeny, 485. 

 Pinulus, 33, 48. 

 Placodidyum cucumaria, O. Schmidt = (Holothurian, 



Thyone), 8. 

 Plakinidse, 497. 



Plates— Sir WyviUe Thomson'-s, 3. 

 Pleionacidfe, 10, 14. , 



Pleorhabdus, n. gen., 514. 

 Pleuralia, 42, 48. 

 Plumicomes, 31, 48, 173. 

 Pol^jaefi', Calcarea, 497. 

 Poliopogon, Wyv. Thomson, 254, 388. 



Poliopogon amadou, Wyv. Thomson, 254, 388 (Pis. 

 xlix., 1.); analysis of spicules, 28; 

 young forms, 256. 

 „ gigan, n. sp. 257, 389 (Pis. xlvii., xlviii.). 



PoIIacidoe, 10, 14. 

 Polylophus, n. gen., 132, 374. 



„ philippinensis (Gray), 133, 374 (Pis. liii., 

 liv.) ; budding, 25. 

 Polyrltabdus, n. gen., 121, 372. 



,, oviformis, n. sp., 121, 372 (PI. xxiii.). 



Portugal, Asconema, 372 ; Dadylocalyx, 350, 403 ; 



Fieldingia, 401 ; Pheronema, 387 ; Sympagella, 



372. 

 Possession Island, Acanthascus, 145, 375. 

 Pouch-like depressions, 171. 

 Pourtal6s, Count, 268 ; exploration, 427. 

 Principalia, 46, 47, 49. 

 Prince Edward Island, Aulascus, 372 ; Aulocalyx, 174 ; 



Rossella, 139, 375. 

 Prostalia, 40, 48. 

 Protaddlleum, 18. 

 Prout, W., 181. 

 Psdalia globulosa, 132. 

 Pseudogasters, Semperella, 261. 

 Pseudogastral cavity, Cyrtaulon, 332. 

 Pseudo-sieve plates, Semperella, 261. 

 Puerto Bueno, Acanthascus, 147, 375; Rhahdocalyptus, 



158, 377. 

 Quoy and Gaimard, 55 ; Alcyoncellum, 99 ; Hahro- 



didyum, 99. 

 Kadial fold's, 169, 171. 

 Raoul or Sunday Islands, Euryplegma, 176, 380; 



Poliopogon, 257, 389. 

 Regadrella, O. Schmidt, 16, 84, 367. 



phamix, O. Schmidt, 62, 84, 367 (PI. xiii.). 

 Reproduction in Farrea, 285. 

 Reserve nutriment, 24. 

 Rhahdocalyptus, n. gen., 155, 377. 



„ mollis, n. sp., 155, 377 (PI. Ixiv.). 



,, roeperi, n. sp., 158, 377 (PI. Lxv.). 



Rhabdodidyum, O. Schmidt, 107, 370. 



delicatum, 0. Schmidt, 106, 107, 

 370 (PI. XX.). 



,, delineatum, 491. 



Rhabdopedella, O. Schmidt, 108, 370. 



„ tintinnus, O. Schmidt, 16, 62, 108, 



370 (PL xii.). 

 Rhabdostauridium, 0. Schmidt, 15, 489. 

 Ridges, 65, 177. 

 Ridley, S. 0., 181. 



