INDEX 



669 



Apical string in larva of Balanoglossus 

 clavigerus, formation of, 573 



Aplysia, 324 



Appendages of braucliial hearts of Loligo, 

 development of, 364 



Appendages, formation of, in embryo of 

 Agelena, 225 ; in embryo of Astacus, 

 183; in embryo of Donacia, 252 ; in 

 embryo of Peripatus capensis, 171 



Appendages of Trilobita, 239 



Appendicular sinus in Peripatus capensis, 174 



Aptera,'245, 263, 265 



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

 pared to Zoaea, 211 



Arachnactis, larva of Cereantliidae, 85 



Arachnida, 169, 177, 204, 206, 251, 254, 

 285, 662 ; development of, 221-244 



Araneina, 221 



Archaeocytes of Plakina, 44 



Archeuteron, formation of, in embryo of 

 Antedon rosacea, 545; m\s.Trva, oi Astenas, 

 461 ; in larva of Asterina gibbosa, 472 ; in 

 embryo of Distaplia, 632 ; in larva of 

 Echinus esculentus, 507 ; in larva of Holo- 

 thuria tubulosa, 641 ; in Peripatus capensis, 

 171; inembryoof P^rosoma, 633 ; in larva 

 of Synapta digitata, 531 ; in Terebratu- 

 lina septentrionalis, 409 ; segmentation 

 of, in embryo of Antedon rosacea, 546 



Arohiannelida, development of, 128-153 



Archioerebrum of Scolopendra, 283 



Arohinephridium oflarvaof ^Mjoomates, 154; 

 formation of, in larva o! Polygordius, 138, 

 140, 144; of Polygordius lacteus, 152 



Arenicola, 129, 153 



Arenicolidae, 157, 168 



Argiope, 416, 455 



Argiope neapolitana, 407 ■ 



Aristotle's lantern, formation of, in Echinus 

 esculentus, 515 



Arms, formation of, in Antedon rosacea, 

 566; in Asterias, 469, 470; in Asterina 

 gibbosa, 474 ; in Ophiothrix fragilis, 492 ; 

 in Solaster, 482 ; in Terebratulina sep- 

 tentrionalis, 413 



Arrow-worms, 428 



Arthropoda, 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 



Ascaris, 659 



Ascaris megalocephala, development of, 43/- 

 447 



Asoidiaoea, 568, 608 



Ascidiacea compositae, 568, 609, 637, 646 



Ascidiacea luciae, 568, 609, 632, 637 



Ascidiacea simplices, 668, 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, 236, 236, 243, 281 



Astacus fluviatilis, development of, 178-189 



Aster, formation of, from middle piece of 

 spermatozoon, 9 



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

 485, 487, 495, 603, 606, 507, 514, 625, 

 569 ; development of, 460-472 



Asterias glacialis, 464, 466, 472, 492, 605 



Asterias pallida, 457 



Asterias rubens, 457, 461, 464, 466, 472, 629 



Asterias vulgaris, 401, 457, 464, 465, 472 



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

 656 ; development of, 473-481 



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

 498, 600, 501, 602, 503, 514, 515, 518, 

 520, 521, 622, 523, 530, 531, 533, 535, 

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

 585 ; development of, 457-484 



Astropecten, 457 



Astropectinidae, 472 



Asymmetry of post-larval Pagurid, 65, 216 



Atrial cavity, formation of, in Amphioxus 

 lanceolatus, 899 ; in Molgula ampulloides, 

 632 ; in Ascidiozooid of Pyrosoma, 640 ; 

 in Blastozooid of Urochorda, 638 



Atrial folds, formation of, in larva ot Amphi- 

 oxus lanceolatus, 599 



Atrial invagination, formation of, in larva 

 of simple Ascidian, 620 ; in larva of 

 Doliolum, 637 ; in embryo of Pyrosoma, 

 634 



Atrial tube of embryo of Pyrosoma, forma- 

 tion of, 634 



Atrium, formation of, in bud of Bugula, 

 397 ; in embryo of Membranipora, 389 ; 

 in embryo of Pedicellina echinata, 400 ; 

 in larva of Pedicellina echinata, 400 ; 

 in Physa (outer stomodaeum), 323 ; in 

 larva of Synapta digitata, 536 



Atrochal larva, definition of, 163 



Auditory organ oi Astacus, 189 



Aurelia, development of, 67-73 



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

 in Loligo, 362 



Auricularia larva, 561, 574, 585 ; structure 

 of, 533 



Axial organ, formation of, m Antedon rosacea, 

 552; m Asterina gibbosa, 480 



Axial sinus, formation of, in Asterina gibbosa, 

 476 ; in Echinus esculentus, 510 



Axolotl, 656 



Azygous tentacles of Antedon rosacea, forma- 

 tion of, 656 



Azygous tube-feet, formation of, in Asterina 

 gibbosa, 476 ; in Echinus esculentus, 518 ; 

 in Ophiothrix fragilis, 492 



Balanoglossida, 668, 569, 575, 586, 589, 662 



