INDEX 



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

 in italics indicate that the reference relates to systematic position ; figures in thick 

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



Abbott, 422 



Abdomen ( = third chamber of Monaxonic 

 Radiolavian shell), 84 



Abdominal cirrhi, 139 f. 



Aboral, blood-ring, of A sterias rubens, 452 ; 

 of Ophiothrix fragilis, 490 ; of Echinus 

 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 



Abylinae, 307 



Abyssal, Eadiolaria, 76 ; Sponges, 239 f. 



Acamptogorgia, 356 



Acanella, 353 ; A. simplex, 353 



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

 myophrisks in, 80 ; Zooxanthella in, 80 ; 

 reproduction of, 86 n. ; skeleton of, 82 



Acanthaster, 458, Jfo% 



Acanthin, 71 n., 75, 76 



Acanthocephala, nutrition of, 38 



Acanthoconia horrandei, 07, 207 



Acanthocystis, 71 ; budding of, 73 ; 

 habitat, 75 



Acanthogorgia, 355 



Acanthometrids ( = Acantharia, q.v.), 

 parasitic Amoebophrya in, 161 



Acanthonida, 78 



Acanthotrochus, 577 



Acarmis, 223 



Accumulative anabolism, growth, 9, 13, 

 15 f. ; in relation to brood-formation, 

 32 f. 



Acephalinidae, 97 



Acineta, 159, 160 



Acinetina = Suctoria, 158 f. 



Acontia, 369 



Acrasieae, 90 f. 



Acrophytum, 353, 349 



VOL. I 



625 



Actine, 183 



Actinelida, 78 



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



sense organ of larva of, 373 ; A. mesem- 



bryanthemum,2>7, 381; 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 

 A ctinocrin us, 594 

 Actinodendron, 384 '> -A- arboreum, 384 ; 



A. glovieratum, 366 ; A. plumosum, 



366, 384 

 Actinoloba (= Metridium), 371, 372, 381 ; 



A. dianthus, 379, 381 ; A. vtarginata, 



378 

 Actinolophus, 70 ; habitat of, 75 

 Actinometra, 588, 589, 594 

 Actinomma, 77 ; A . asteracanthion, skeleton 



of, 77 

 Actinomonas, 70, 73, 75 n. 

 Actinomyxidiaceae, 98 

 Actinophrys, 70 f., 96 n. ; A. sol, 71 \ 



habitat of, 75 

 Actinopoda, 570 

 Actinosphaerium, 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, 



382), 379 

 Actinotryx, 371, 383 ; A. mussoides, 383 

 Actinozoa = Anthozoa, - 

 Actipylaea (= Acantharia), 76 

 Actissa, 77, 83 

 Acystosporidae, 97, 102 f. ; active zygote 



of, 34 

 Adambulacral, ossicle, of Asterias rubens, 



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



2 s 



