670 



INVERTEBEATA 



Balanoglossus, 1, 381, 467, 584, 587, 605 



Balanoglossus clavigerus, 575 ; development 

 of, 570-574 



Ball eggs of Ascaris megalocephala, 453 



Barrel-shaped larva of Synapta digitata, 538 



Basal cells in Molluscan cross iu eggs of 

 Gastropoda, divisions of, 322 ; in Mollus- 

 can cross in embryo of Patella, 294 



Basal plates, formation of, in Amphiura 

 squamata, 499 ; in Caryophyllia cyathus, 

 87 



Basal ring of plates in larva of Antedon 

 rosacea, formation of, 547 



Bathycrinus, 559, 560 



Bdelloida, 418 



Bell rudiment of Medusa of Tubularia, 58 



Beroe, development of, 89-95 ; experiments 

 on eggs of, 96, 97, 98 



Beroe forskalii, 89 



Beroe ovata, 89 



Beroidea, 53 



Biogenetic law, 20, 649 



Bipinuaria larva, 472, 474, 483, 487, 490, 491, 

 492, 529, 532, 533, 542, 543, 574, 585 ; 

 of Asterias, 464 ; of Astropectinidae, 472 



Birds, fertilization of eggs of, 12 



Bivalens, race of Ascaris megalocephala, 

 439 



Bivalve shell of Cyphonautes larva, 392 



Bladder of Callidina russeola, formation of, 

 426 



Blastocoele in Actinotrocha larva, 382 ; in 

 egg of Agelena, 223 ; formation of, in 

 embryo of Antedon rosacea, 545 ; iu larva 

 of Asterias, 461 ; iu embryo of Cynthia 

 partita, 614 ; in embryo of Dreissensia, 

 333 ; in larva of Echinus esculentus, 

 506 ; in Grantia, 38 ; in embryo of Mem- 

 branipora, 387 ; in Patella, 295 ; in Poly- 

 gordius, 140 ; equivalent to haemocoele, 

 172; equivalent to primary body-cavity, 

 165 



Blastocones in egg of Sepia, 355 



Blastoderm, formation of, in Astacus, 180 ; 

 in Scolopendra, 281 ; in Sepia, 355 



Blastoidea, 456 



Blastomere, definition of, 27 



Blastomeres of egg of Cynthia partita, 

 development of when isolated, 630 ; of 

 egg of Sepia, 354 



Blastoporal pit of embryo of Blatta, 261 



Blastopore, closure of, in embryo of Amphi- 

 oxus lanceolatus, 591 ; in embryo of 

 Antedon rosacea, 545 ; in embryo of 

 Ascaris megalocephala, 445, 446; in em- 

 bryo of Astacus, 182 ; in Balanoglossus 

 clavigerus, 571 ; in embryo of Cynthia 

 jxirtita, 619 ; in embryo of Dreissensia, 

 336 ; iu embryo of Euphausia, 192 ; of 

 embryo of Membranipora, 388 ; in embryo 

 of Patella, 298 ; in embryo of Pedicellina, 

 399 ; in embryo of Pyrosoma, 634 ; of 

 Sagitta bipunctata, 431 ; of Terebratulina 

 septentrionalis, 409, 410 



Divided into mouth and primitive anus 

 in embryo of Polygordius, 139 



Persistence of, in larva of Asterias, 461 ; 

 in embryo of Aurelia, 68 ; as mouth 

 and anus in embryo of Peripatus capensis, 

 171 



Represented by primitive streak and 

 primitive cumulus in Arachuida, in an 

 embryo, 241 



Blastostyle of Clava, 62 



Blastozooid in Diplosomidae, development of, 

 642-644 ; of Salpa, 640 ; in Urochorda, 

 definition of, 6.38 



Blastozooids (buds) of Doliolum, 640, 641 



Blastula of Amphioxus lanceolatus, 589 ; of 

 Antedon rosacea, 545 ; of Ascaris megalo- 

 cephala, 443; of Astacus, 180 ; of Asterias, 

 460 ; of Aurelia, 68 ; of Balanoglossus 

 claoigerus, 570, 571 ; of Callidina russeola, 

 422; of Cerebratulus lacteus, 119; ofClath- 

 rina, 47 ; of Cucumaria planci, 541 ; of 

 Cynthia partita, 614; of Echinus esculentus, 



507 ; of Euphausia, 192 ; of Grantia, 38 ; 

 of Holothuria tubulosa, 541 ; of Leuco- 

 solema, 47 ; of Macrobiotus, 243 ; of 

 Ophiothrixfragilis, 486, 487; of Ophiura 

 brevispina, 501 ; of Oscarella, 43 ; of 

 Pallene, 243 ; of Patella, 295 ; of Pedi- 

 cellini, 398 ; of Plakina, 44 ; of Polygor- 

 dius, 132, 139 ; of Polyphemus, 193 ; of 

 Sagitta bipunctata, 429 ; of Synapta digi- 

 tata, 530 ; of Terebratulina septentrionalis, 

 408, 409 ; of Tubularia, 54 ; of Urticina 

 crassicornis, 77 ; formed from egg of free 

 medusa, 59 ; interpretation of, 660 



Blatta, 288 ; embryonic development of, 

 261, 262 



Blood-spaces of Loligo, formation of, 361, 

 362 



Blood-system of Echinus esculentus, forma- 

 tion of, 518 



Blood-vessels of Polygordius appendiculatus, 

 formation of, 152 



Body-rods of larva of Echinus esculentus, 



508 ; of larva of Ophiothrix fragilis, 487 

 Bolina, experiments on the eggs of, 98 

 Bombyx mori, metamorphosis of, 279, 



280 



Borax-carmine, use of, 35 

 Botryllidae, 642 

 Botryllus, 638, 644 ; development of buds 



of, 641, 642 



Brachiolar anus of larva of Asterias, 467 

 Brachiolaria larva, '565 ; of Asterias, 467- 



469 

 Brachiopoda, 435, 585, 661 ; development 



of, 407-417 



Brachyura, 177, 208, 213, 215 

 Brain, formation of, of Callidina russeola, 



424 ; of Sagitta bipunctata, 432 

 Brain-vesicles, formation of, in Antedon 



rosacea, 557 ; in larva of Cynthia partita, 



619 

 Branchial cavity of Astacus, 188 



