676 



INVEETEBEATA 



Experiments on the eggs of Ascaris, 448-454 ; 

 on the eggs of Beriie, 96, 97 ; on the eggs 

 of Bolina, 98 ; on the eggs of Cerebratulus, 

 124-126 ; on the eggs of Giona, 631 ; on 

 the eggs of Clytia, 96, 97 ; on the eggs of 

 Cynthia partita, 630 ; on the eggs of 

 Dentalium, 329 - 332 ; on the fertilized 

 eggs of Echinoidea, 624, 525 ; on the eggs 

 of Geryonia, 96 ; on the eggs of Laodice, 

 96 ; on the eggs of Liriope, 96 ; on the 

 eggs of Mitrocmna, 96 ; on the eggs of 

 Molgula, 631 ; on the eggs of Patella, 

 305-309 ; on the eggs of PhaUusia, 631 



External opening of kidney of Dreissensia, 

 formation of, 345 



External perihaemal ring-canal of Asterina 

 gibbosa, formation of, 475 



External yolk-sac of Loligo, formation of, 

 360 



Eye, formation of, in larva of simple Asoidian, 

 620 ; in Balanoglossus clavigerus, 574 ; in 

 Loligo, 357 ; in Pahidina, 315 ; in Patella, 

 302 ; inPeripatiis capensis, 176 ; in larvaof 

 Phascolosoma, 376 ; in larva of Polygordius 

 appendiculatus, 148 ; in Sagitta bipunctata, 

 433 ; in New England Tornaria, 575 



Eyelids, formation of, in Loligo, 363 



Eye-spot, formation of, in larva of Dytiscus, 

 273 



Eye-stalk, formation of, in Astacus, 184, 

 189 ; in Loligo, 357 



Fascia of muscles, formation of, mAmphioxus 

 lanceolatus, 599 



Fat body, formation of, in embryo of 

 Donacia, 256 ; in embryo of Scolopendra, 

 283 



Fat cells in embryo of Agelena, 227 



Female, definition of, 2 



Female pronucleus, 9 



Fertilization of egg of Cynthia partita, 611 



Filament plate, formation of, in Phyllodromia, 

 263 



Fin-ray cavities, formation of, in larva of 

 Aiiiphioxus lanceolatus, 599 



Fin-rays, formation of, in Amphioxus lanceo- 

 latus, 599 



Fiona, 320, 321, 323, 324 



First maxilla oi Astacus, 186 



First maxillary segment in Donacia, 252 



First polar body, definition of, 9 



First somatoblast, formation of, in Dreis- 

 sensia, 333 ; in Nereis, 155 ; in Nephelis, 

 160 



Fissthrdla, 300, 304, 320 ; metamorphosis 

 of larva of, 305 



Fixation, definition of, 39 ; of larva of Ante- 

 don rosacea, 548 ; of Brachiolaria larva of 

 Asterias, 409 ; of larva oi Asterina gibbosa, 

 473 ; of larva of Clathrina, 47 ; of larva, 

 of Bsperia, 45 ; of larva of Grantia, 39- 

 41 ; of larva of Lcucosolena, 47 ; of Cypho- 

 nautes larva oi ■ Membranipiora, 394; of 

 larva of Oscarella, 44 ; of larva of Phy- 



lactolaemata, 396 ; of larva of Sxmngilla, 



47 

 Fixation pit of larva of Antedon rosacea, 



formation of, 547 

 Fixed cheek in Trilobite larva of Limulus, 



238 

 Fixing disc of larva ot Antedon rosacea, 551 ; 



of larva of Asterias, 469 ; of larva of 



Asterina gibbosa, 473 

 Flabellum of Limulus, 237 

 Flemming's fluid, composition and use of, 33 

 Flies, larvae of, 25 



Float, development of, in Siphonophora, 66 

 Floscularidea, 418 

 Flustrella, larva of, 395 

 Follicle cell, definition of, 3 

 Pood -yolk, 19; definition of, 3. ' (See 



Deuteroplasm.) 

 Foot, formation of, in Dentalium, 329 ; 



in Dreissensia, 342 ; in Paludina, 314, 



323 ; in Patella, 299 ; in Trochus, 323 

 Foot-gland, formation of, in Callidina rus- 



seola, 425 

 Foot-plate, formation of, in larva of Antedon 



rosacea, 551 

 Foot segment in larva of Terebratulina sep- 



teiitrionalis, 411 

 Fore-foot, formation of, in Loligo, 358 

 Formalin, iise of, 33 

 Formation of layers, definition of, 27 ; in 



Crustacea, 191-196 ; interpretation of, 669 

 Formative stimuli in eggs of Echinoidea, 528, 



629 

 Free cheek in Trilobite larva of Limulus, 



238 

 Frontal field in larva of Asterias, 464 

 Frontal filament in Nauplius larva of Cirri- 



pedia, 202 

 Functional continuity, law of, 66 

 Funnel of nephridium of Criodrilus lacMum, 



formation of, 159 ; in Ctenophora, 561 ; 



completion of, in Loligo, 362 ; formation 



of, in Loligo, 357 



Galerucdla, 271, 272, 277, 280 



(?«ZenjceMaM2mi, metamorphosis of, 267-270 



Gamete, definition of, 2 



Gametogenesis, definition of, 2 



Ganglion, formation of, of adult Ciona in- 

 testinalis, 622 ; of Donacia, 252 



Gastral filaments, formation of, in Aurelia, 

 71 



Gastral groove in embryo of Donacia, 250 ; 

 closure of, in embryo of Donacia, 253 



Gastropoda, 291, 504, 651 ; ancestors of, 

 368, 369 ; development of, 290-324 



Gastro-vascular canals of Ctenophora, 561 



Gastrula, definition of, 68 ; interpretation of, 

 661; oi Antedon rosacea, 545; oi Ascaris 

 megalocephala, 443, 444; of ^stoctts,,180; 

 oi Asterias, 460; oi Asterias, experiments 

 on, 483 ; oi Aurelia, 68; of Balanoglossus 

 clavigerus, 571 ; of Cerebratulus lacteus, 

 120; oi Echinus esculentus, 507; oi Macro- 



