INDEX 



669 



Apical string in larva of Balanoglossus 

 clavigerus, formation of, 573 



A/ih/sia, 324 



Appendages of branchial hearts of Loli/jo, 

 development of, 364 



Appendages, formation of, in embryo of 

 Agelena, 225 ; in embryo of Asdici/*, 

 183; in embryo of Donacia, 252; in 

 embryo of Peripatus capensis, 171 



Appendages of Trilobita, 239 



Appendicular sinus in Peripatus capensis, 1 74 



Aptera, 245, 263, 265 



Apus, 200 ; ancestral, origin of, 212 ; com- 

 pared to Zoaea, 211 



Araclinactis, larva of Cereanthidae, 85 



Arachnida, 169, 177, 204, 205, 251, 254, 

 285, 662 ; development of, 221-244 



Araneina, 221 



Archaeocytes of Plakina, 44 



Archeuteron, formation of, in embryo of 

 Antedon rosacea, 545 ; in larva of Asterias, 

 461 ; in larva of Asterina gibbosa, 472 ; in 

 embryo of D'istaplia, 632 ; in larva of 

 Echinus esculentus, 507 ; iu larva of JIolo- 

 thuria tubulosa, 541 ; iu Peripatus capensis, 

 171; in embryo of Pyrosoma, 633 ; in larva 

 of Synapta digitata, 531 ; in Terebratu- 

 lina septentrionalis, 409 ; segmentation 

 of, iu embryo of Antedon rosacea, 546 



Archiannelida, development of, 128-153 



Archicerebrum of Scolopendra, 283 



Archiuephrklium ofla.rva.of Eupomatus, 154; 

 formation of, in larva of Polygordius, 138, 

 140, 144; of Polygordius lacteus, 152 



Arenicola, 129, 153 



Arenicolidae, 157, 168 



Argwpe, 416, 455 



A njiope neapolitana, 407 



Aristotle's lantern, formation of, in Echinus 

 esculentus, 515 



Anns, formation of, in Antedon rosacea, 

 556; in Asterias, 469, 470; in Asterlna 

 gibbosa, 474 ; in Ophiothrix fragilis, 492 ; 

 in Solaster, 482 ; in Terebratulind sep- 

 tentrionalis, 413 



Arrow-worms, 428 



Artliropoda, 455, 655, 656, 661, 662 ; cuticle 

 of, 19 ; development of, 169-290 ; fossil 

 representatives of, 20 



Arthrostraca, 177 



Artificial parthenogenesis of eggs of Echi- 

 noidea, 524 



A scar in, 659 



Ascaris megalocephala, development of, 437- 

 447 



Ascidiacea, 568, 608 



Ascidiacea compositae, 568, 609, 637, 646 



Ascidiacea luciae, 568, 609, 632, 637 



Ascidiacea simplices, 568, 609, 637, 646 



Ascidians, 98 ; eggs of, 11 



Ascidian tadpole, 65 



Ascidiozooids of Pyrosoma, 640 



Asconidea, 37 ; development of, 46, 47 



Asexual germ, definition of, 2 



Asexual reproduction in Urochorda, 637-646 



Aspidobranchiata, 291, 301 



Asplanchna Herricki, 418 



Asplanchnidea, 418 



Astacidae, 213 



Astacus, 191, 194, 195, 197, 198, 223, 



230, 235, 236, 243, 281 

 Astacus Jluviatilis, development of, 178-189 

 Aster, formation of, from middle piece of 



spermatozoon, 9 

 Asterias, 474, 475, 476, 477, 478, 483, 484, 



485, 487, 495, 503, 506, 507, 514, 525, 



569 ; development of, 460-472 

 Asterias glacialis, 464, 466, 472, 492, 505 

 Asterias pallida, 457 



Asterias rubens, 457, 461, 464, 466, 472, 529 

 Asterias vulgar is, 401, 457, 464, 465, 472 

 Asterina gibbosa, 457, 482, 495, 536, 569, 



656 ; development of, 473-481 

 Asteroidea, 287, 456, 494, 495, 496, 497, 



498, 500, 501, 502, 503, 514, 515, 518, 



520, 521, 522, 523, 530, 531, 533, 535, 



538, 541, 543, 560, 563, 564, 565, 569, 



585 ; development of, 457-484 

 Astropecten, 457 

 Astropectiuidae, 472 



Asymmetry of post-larval Pagurid, 65, 216 

 Atrial cavity, formation of, in Amphio.i-u* 



lanceolatus, 599 ; in Molgula anipullmdes, 



632 ; in Aseidiozooid of Pyrosoma, 640 ; 



in Blastozooid of Urochorda, 638 

 Atrial folds, formation of, in larva of ^-1 mp/i /'- 



oxus lanceolatus, 599 

 Atrial imagination, formation of, in larva 



of simple Ascidian, 620 ; in larva of 



Itoliolum, 637 ; in embryo of Pyrosoma 



634 



Atrial tube of embryo of Pyrosoma, forma- 

 tion of, 634 

 Atrium, formation of, in bud of Buytihi, 



397 ; in embryo of Membranipora, 389 ; 



in embryo of Pedicellina echinata, 400 ; 



in larva of Pedicellina echinata, 400 ; 



in Physa (outer stomodaeum), 323 ; iu 



larva of Synapta, digitata, 536 

 Atrochal larva, definition of, 153 

 Auditory organ of Astacus, 189 

 Aurelia, development of, 67-73 

 Auricle of heart, formation of, in Cyclas, 350 ; 



in Luli;/o, 362 

 Auricularia larva, 561, 574, 585 ; structure 



of, 533 

 Axial organ, formation of, va. Antedon rosacea, 



552 ; in Asterina yibbosa, 480 

 Axial sinus, formation of, in Asterina gibbosa, 



475 ; in Echinus esculentus, 510 

 Axolotl, 656 



Azygous tentacles of Antedon rosacea, forma- 

 tion of, 556 

 Azygous tube-feet, formation of, in Asli-rinn 



gibbosa,476 ; in /,'<// ////>,v >-. H I ,-n his, 518 ; 



in Op// intli ri.r /'rinjilis, 492 



Balanoglossida, 568, 569, 575, 585, 589, 6tJ2 



