INDEX 



Every reference is to the i)age : words in italics are nanu's of genera or si)ecies ; tigures 

 in italics indicate that the reference rehites t.i systematic position ; tigures in thick 

 type refer to an illustration ; f. = and in following page or pages ; u. = note. 



Alihott, 422 



Abdomen (= third chamber of Monaxonic 

 Kadiolariau shell). Si 



Abdominal cirrhi, 139 f. 



Aboral, blood-ring, of ^Is^e/'iVts ruhens, 452 ; 

 of Ophiothrixfrarjills, 490 ; of Echinus 

 esculent us, 529 ; coelom, of Antedon 

 rosacea, 585 ; nervous system, of 

 Antedon rosacea, 584 ; sinus, of Asterias 

 ruhens, 449 ; of Ophiothrix fragilis, 

 490 ; o{ Echinus esculenius, 528, 529 



Abortive nuclei, of Myxosporidiaceae, 107 



Ahi/la, 307 



Abyliuae, 307 



Abyssal, Eadiolaria, 76 ; Sponges, 239 f. 



Acamptogonjia, 336 



Acanella, 353 : A. simplex, 353 



Acantharia (Actipylaea), 76, 78, 78, 80 ; 

 myophrisks in, 80 ; Zooxanthella in, 80 ; 

 reproduction of, 86 n. ; skeleton of, 82 



Acanthuster, 458, 462 



Acantliin, 71 n., 75, 76 



Acanthocephala, nutrition of, 38 



Accmthoconia harrandei, 207. 207 



Acanthocystis, 71 ; budding of, 73 ; 

 habitat, 75 



Acanthogorgia, 355 



Acanthometrids ( = Acantharia, q-v.), 

 parasitic Amoehophrija in, 161 



Acanthonida, 7S 



Acanthotrochus, 577 



Acarnus, 223 



Accumulative analiolism, growth, 9, 13, 

 15 f. ; in relation to brood-formation, 

 32 f. 



Acephalinidae, 97 



Acineta, 159, 160 



Acinetina = Suctoria, l.'>8 f. 



Acoutia, 369 



Acrasieae, 96* f. 



Acrophytum, 3^33, 349 



VOL. I 6: 



Actine, 183 



Actinelida, 78 



Actinia, 381 ; A. cari, 378 ; A. equincc, 



sense organ of larva of, 373 ; xi. viescin- 



bryanthemu7n,'379, 'S8l; longevity of, 375 

 Actiniaria, 377 f. ; viviparity of, 373 ; 



symbiosis of, 377 ; colours of, 379 

 Actiniidae, 381 

 Actiniina, 380 

 Actinobolus, 137 ; tentacles and tricho- 



cysts of, 152 

 Actinocrinus, 594 

 Actinodendron, 384 i ^'- arboreum, 384 ; 



A. glomeratum, 366 ; ^1. plumosuin, 



366, 384 

 Actinoluba{= Melridittm), 371, 372, 381 ; 



A. dianthus, 379, 381 ; A. marginata, 



378 

 Actinolophus, 70 ; habitat of, 75 

 Actinovietra, 588, 589, 594 

 Actinovima, 77 ; A. asteracanfhion, sktletnn 



of, 77 

 Actinomonas, 70, 73, 75 n. 

 Actinomyxidiaceae, 98 

 Actinophrys, 70 {., 96 n. ; A. sol, 71 ; 



habitat of, 75 

 Actinopoda, 570 

 Actinosphaerivm, 70, 72 f. ; endogamy 



of, 73 f., 75 ; regeneration of, 35 ; .1. 



eiclinrnii, 72 

 Actinostdla (usually place<l in Elertwig"s 



familv Faractidae, allied to Bunodidae, 



.55^')," 379 

 Actinutryx, 371, 383; A. mussoides, 383 

 Actinozoa = Anthozoa, 326 f. 

 Actipylaea ( = Acantharia), 76' 

 Actissa, 77, 83 

 Acystosporidae, 97, 102 f. ; active zygote 



of, 34 

 Adaaibulacral, ossicle, of Asterias ruhens, 



434; of Ophiothrix frag ilia, 4/9; of 



2 s 



