670 



INVERTEBRATA 



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



Balanoglossus davigerus, 575 ; development 

 of, 570-574 



Ball eggs of A scar is nieffaloeephala, 453 



Barrel-shaped larva of Synapta digitata, 538 



Basal cells in Molhiscan cross iu eggs of 

 Gastropoda, divisions of, 322 ; in Mollus- 

 cau cross in embryo of Patella, 294 



Basal plates, formation of, in Arnphnna 

 squamata, 499 ; in Caryophyllia, cyathus, 

 87 



Basal ring of plates in larva of Antedon 

 rosacea, formation of, 547 



Bathycrinus, 559, 560 



Bdelioida, 418 



Bell rudiment of Medusa of Tubularia, 58 



BerOe, development of, 89-95 ; experiments 

 on eggs of, 96, 97, 98 



Beroe forskalii, 89 



Bertie ovata, 89 



Beroidea, 53 



Biogenetic law, 20, 649 



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

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

 of Asterias, 464 ; of Astropectiuidae, 472 



Birds, fertilization of eggs of, 12 



Bivalens, race of A scar is 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 ; in larva 

 of Asterias, 461 ; in embryo of Cynthia 

 partita, 614 ; in embryo of Dreissensia, 

 333 ; iu larva of Echinus esculentus, 

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

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

 gnrdins, 140 ; equivalent to haemocoele, 

 1 72 ; equivalent to primary body-cavity, 

 165 



Blastocones in egg* u 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 parti/n. 

 development of when isolated, 630 ; of 

 egg of Sepia, 354 



Blastoporal pit of embryo of Blatta, 261 



Blastopore, closure of, in- embryo of Amplii- 

 oxus lanceolatns, 591 ; in embryo of 

 Antedon rosacea, 545 ; iu embryo of 

 Ascaris megalocephala, 445, 446 ; in em- 

 bryo of Astacus, 182 ; in Balanoglossus 

 davigerus, 571 ; in embryo of Cynthia 

 partita, 619 ; in embryo of Dreisxensitt, 

 336; iu embryo of Euphausia, 192; of 

 embryo of Membranipora, 388 ; in embryo 

 of Patella, 298 ; in embryo of Pedicel! inn, 

 399 ; in embryo of Pyrosoma, 634 ; of 

 Sagitta bipunctata, 431 ; of Terebratulina 

 septentrional is, 409, 410 



Divided into month and primitive aims 

 in embryo of Polygordius, 139 



Persistence of, in larva of Asterias, 461 ; 

 in embryo of Aurelia, 68 ; as mouth 

 and amis in embryo of Peri/iatn* citpeiisis, 

 171 



Represented by primitive streak and 

 primitive cumulus in Arachnida, in an 

 embryo, 241 



Blastostyle of Clava, 62 



Blastozooid in Diplosomidae, development of, 

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

 definition of, 638 



Blastozooids (buds) of Dolioluni, 640, 641 



Blastula of Amphioxus lanceolatus, 589 ; of 

 Antedon rosacea, 545 ; of Ascaris iiicgalo- 

 cephala, 443; of Astacus, ISO; of Asteri</x, 

 460 ; of Aurelia, 68 ; of Balanoglossus 

 davigerus, 570, 571 ; of Callidina russeola, 

 422; of Cerebratulus lacteus, 119; of Clath- 

 rina, 47 ; of Cucti/naria planci, 541 ; of 

 Cynthiapartita, 614; of Echinus esculentus, 



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

 of Holothui'ia tubulosa, 541 ; of Leuco- 

 solema, 47 ; of Macrobiotus, 243 ; of 

 Ophiothrix frag His, 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 appenSiculatus, 

 formation of, 152 



Body-rods of larva of Echinus esculentus, 



508 ; of larva of Ophiothrix fragilis, 487 

 JSn/iiia, experiments on the eggs of, 98 

 Boinbyx 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 Cal/idina russeola, 



424 ; of Sagitta bipunctata, 432 

 Brain- vesicles, formation of, in Antedon 



rosacea, 557 ; in larva of Cynthiapartita, 



619 

 Branchial cavity of Astacus, 188 



