628 



INDEX 



554 ; of Neolampas, 554 ; of Holothnria 

 nigra, 560; oi Antedon rosacea, 582 ; of 

 Dipleurula larva, 604 ; of Asterina 

 gibbosa, 611 



Aphodal, 210 



Aphrothoraca, 70 



Aplanospore, 31 



Aplysilla, 196 



Aplysina, 225 



Apocyte, 30, 32 



Apocytial, condition, 32 ; forms among 

 Myxosporidiaceae, 107 f.; Rhizopoda, 52 



Apolemia, 308 



Apoleniinae, SOI 



Apopyle, 170 



Aporosa, 397 



Appendicularia, host of Qyvmodinium 

 pulvisculus, 132 



Aquatic organisms, minute, distribution 

 of, 47 n. 



Arachnactis, 373, J+ll ; ii. albida, 411 ; 

 A. americana, 411 ; A. lloydii, 411 



Arachnoides, 549 



Arbacia, 520, 53S 



Arbaciidae, 530, 531, 532, 538, 558 



Arbacioid type of ambulacral plate, 531, 

 5S8 



Arcadomyaria, 324 



Arcella, 51, 53 ; A. vulgaris, 55 



Archaeocidaridae, 557, 558 



Archaeocyte, 171 



Archaster, 467 ; A. bifrons, 467 



Archasteridae, 456, 466 



Arehenteron, definition of, 604 



Archer, on Protozoa. 45 ; on Heliozoa, 71 



Archicoel, 450 



Arcuothrix, 52 ; transition between 

 pseudopodium and fiagellum in, 47 n. 



Arenaceous Foraininifera, 58 f. ; Carpen- 

 ter on, 63 f . ; labyrinthine structure 

 in, 66 



Argas persica, 121 



Aristocystis, 599, 599 



Aristotle, 166 



Aristotle's lantern, of Echinus escxdentus, 

 515, 516, 524, 525 ; variations of, in 

 Endocyclica, 531 ; of Echinarachnius 

 parma, 546, 547 ; absent in Echino- 

 cardium cordatum, 550 



Arm, of Asteroidea, 431, 432, 453 ; of 

 Ophiothrix fragilis, 479 ; of Ophiu- 

 roidea, 481, 491 ; of Crinoidea, 580, 

 589 ; of Antedon rosacea, 581 ; of 

 Antedon (other species), 594 ; of Hyo- 

 crinus, 590 ; of Rhizocrinus, 591 ; of 

 Bathycrinus, 591 ; of Pentacrinidae, 

 592 ; of Holopus, 594 ; of Eudiocrinus, 



594 ; of Inadunata, 595 ; of Articulata, 



595 ; of Camerata, 595 ; development 

 of, in Asterina gibbosa, 611 ; in Antedon 

 rosacea, 620 



Arm-spines, of Ophiothrix fragilis, 479 ; 



of Ophiuroidea, 491; of Ophiothrix, 492 



of Ophiacantha, 492 ; of Ophiopter 



492 

 Aromatic compounds in relation tc 



nutrition and antisepsis, 36 

 Arthropods, hosts of Gregarines, 97 f. 

 Articulata, 595 

 Ascitic dropsy, Leydenia associated witl 



91 

 Ascon, 185 t 



Asconema setubalense, 221 

 Asexual reproduction of Asteroidea, 459 



of Linckia,- 459 ; of Asterina wega, 45 i 

 Ashworth, 331 n. 

 Asiphonacea, 31{<f 

 Asphyxia, its effect on contractile vaci 



ole, 143 



Aspidochirota, 568, 569, 570 f., 577, 578 

 Aspidosoma, 476 

 Aspirotrichaceae, 137, 148, 151, 153, 154 

 Assimilation, assimilative anabolism, 



growth, 9, 13, 15 f. 

 Association, in Gregarines, 95, 98 f. ; ii 



Lankesteria ascidiae, 95 f. 

 Astasia, 110, 112 

 Aster ( = centrosome of mitotically dividing 



cell and peripheral rays), 25, 27 ; (a 



polyaxonid spicule), 184 

 Asterias, 47%, 475 ; A. rubens, 432 ; 



external features, 432 ; pedicellariae, 



433 ; skeleton, 434 ; coelom, 437 ; 

 alimentary canal, 438 ; food, 439 ; 

 water - vascular system, 441 ; nervous 

 system, 444 ; perihaemal spaces, 448 ; 

 blood - system, 449 ; genital organs, 

 451 ; A. glacialis, 473 ; pedicellariae, 



434 ; A. hispida, 474 ; A. muelleri, 



473 ; A. murrayi, 473 ; A. ochracea, 



474 ; A. polaris, 474 ; A. spirabilis, 

 601,. 602 ; A. tenuispina, 453 



Asteriidae, 453, 458, 473 



Asterina, 454, 456, 459, 461, 463; A. 

 gibbosa, number of arms, 453 ; eggs of 

 463 ; development of, 609, 610 f., 617 

 A. wega, 459 



Asterinidae, 455, 458, 463 . 



Asternata, 554 



Asteroid stage in the development 

 Ophiuroidea and Echinoidea, 613, 622 



Asteroidea, 4^0, 431 f. ; compared with 

 Ophiuroidea, 477 f. ; compared with 

 Echinoidea, 503, 558 ; mesenchyme of 

 larva of, 602 ; development of, 605, 

 608, 609, 610 f. ; phylogeny of, 621 



Aster opsis, 471 



Aster osmilia, 40 1 



Asthenosoma, 536 ; A. hystrix, 536, 537 

 A. urens, 536 



Astraeidae, 387, 399 



Aslraeopora, 390 



Astrangia, 400 ; .4. solitaria, 374, 400 



Astrocnida, 501 



