INDEX 



Every reference is to the page : words in italics are names of genera or species ; figures 

 in italics indicate tliat the reference relates to systematic position ; ligures in tli'ick 

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



Abbott, 422 



Abdomen ( = third chamber of Monaxonio 

 Radiolarian shell), 84 



Abdominal cirrhi, 139 f. 



Aboral, blood-ring, oiAsterias rubens, 452 ; 

 of Ophiothrix fragiliSj 490 ; of JEchinus 

 escidentus, 529 ; coelom, of Antedon 

 rosacea, 585 ; nervous system, of 

 Antedon rosacea, 584 ; sinus, of Asterias 

 rubens, 449 ; of Ophiothrix fragilis, 

 490 ; of Echinus esculentus, 528, 529 



Abortive nuclei, of Myxosporidiaceae, 107 



Abyla, 307 



Abyliuae, S07 



Abyssal, Radiolaria, 76 ; Sponges, 239 f. 



Acamptogorgia, 356 



Acanella, 353 : ^-1. simplex, 353 



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

 myophrisks in, 80 ; Zooxanthella in, 80 ; 

 reproduction of, 86 n. ; skeleton of, 82 



Acanthaster, 458, ^ffS 



Acanthin, 71 n., 75, 7Q 



Acanthocephala, nutrition of, 38 



Acanthoconia barrandei, W7, 207 



Acanthocystis, 71 ; budding of, 73 ; 

 habitat, 75 



Acanthogorgia, 355 



Acanthometrids ( = Acantharia, q.v.), 

 parasitic Amoebophrya in, 161 



Acanthonida, 78 



AcaniJiotrochus, 577 



Acarnus, 223 



Accumulative anabolism, growth, 9, 18, 

 15 f. ; in relation to brood-formation, 

 32 f. 



Acephalinidae, 97 



Acineta, 159, 160 



Aoinetina = Suctoria, 158 f. 



Acontia, 369 



Acrasieae, 90 f. 



Acrophytum, 333, 349 



VOL. I 625 



Aotine, 183 



Actinelida, 78 



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



sense organ of larva of, 373 J A. niesem- 



bryanthemum,S79,S81; 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 '> -^- arboreum, 384 ; 



A. glomeratum, 366 ; A. plumosum, 



366, 384 

 Actinoloba {= Aletriclium), 371, 372, 381 ; 



A. dianthus, 379, 381 ; A. viarginafa, 



378 

 Actinolophus, 70 ; habitat of, 75 

 Actinometra, 588, 589, 594 

 A ctinoniTna, 77 ; A. asteracanthion, skeleton 



of, 77 

 Actinomonas, 70, 73, 75 n. 

 Actinomyxidiaceae, 98 

 Actinophrys, 70 f., 96 u. ; A. sol, 71 ; 



habitat of, 75 

 Actinopoda, 670 

 Actinosphaerivm, 70, 72 f. ; endogamy 



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



eichornii, 72 

 Actinostola (usually placed in Hertwig's 



family Paractidae, allied to Bunodidae, 



S8J1), 379 

 Aetinotryx, 371, 383 ; A. mussoides, 383 

 Actinozoa = Anthozoa, 326 f. 

 Actipylaea (= Acantharia), 76 

 Actissa, 77, 83 

 Acystosporidae, 97, 102 f. ; active zygote 



of, 34 

 Adambulacral, ossicle, of AsteHas rubens, 



434 ; of Ophiothrix fragilis, 479 ; of 



2 s 



