688 



INVERTEBRATA 



Sabelliformia, 128, 154 



tfabineu, MysLs larva of, 215 



Sacculi, formation of, in Antedon rosacea, 552 



Kdi/drtid /inrdxitii-it, 85 



Sagitta bipnnctata, development of, 428-435 



Salamander, changes induced in by changes 



in environment, 651 

 Salivary glands, formation of, in Callidina. 



russeola, 424 ; in Loligo, 358, 364 ; in 



Peripattis capensis, 175 

 tialpa, 637, 639, 640 ; development of, 635, 



636 

 Scaphopocla, 291 ; ancestors of, 368, 369 ; 



development of, 325-329 

 Scarabaeidae, 277 

 Schizocoele, formation of, in Pobjyurtlitm 



appendiculatus, 150 

 Schizopoda, 177, 185, 192, 202, 210, 213, 



216, 218 

 Seirtopoda, 418 

 Scleroblasts of Grantia, 43 

 Scoleciformia, 128, 153 



Kcolopendra, 285 ; development of, 281-284 

 Scorpion, 221 ; development of, 239-241 

 Scorpionidea, 221 



Scutum, formation of, in Cirripedia, 202 

 Si-i/llnriix, 214 



Scyphistoma, 72, 75 ; of Aurelia, 70 

 Scyphozoa, 78, 79, 96, 166, 661 ; develop- 

 ment of, 67-76 



Sea-anemone, definition of, 87 

 Sea- spiders, 242 

 Sea-urchin, eggs of cross - fertilized with 



foreign sperm, 17 

 Second maxilla in Astacns, 186 

 Second maxillary segment in Donacia, 252 

 Second polar body, definition of, 9 

 Second somatoblast in segmenting egg of 



Dreissensia, 335 ; in segmenting of JYereis, 



156 

 Secondary body-cavity, equivalent to coelom, 



165 

 Secondary dorsal organ, formation of, in 



Donacia, 247, 259 

 Secondary germ - cells, formation of, in 



Donacia, 263 

 Secondary gill-slits, formation of, in larva of 



Amphioxus lanceolatus, 604 

 Secondary madreporite, formation of, in 



Si/iiapta digitata, 539 

 Secondary mesenchyme, formation of, in 



Ophiothrix fragttis, 487 

 Secondary mesoderm, formation of, in egg of 



Astacns, 181 

 Secondary radial plates, formation of, in 



Antedon rosacea, 556 

 Secondary stomodaeum, formation of, of 



Callidina russeola, 423 

 Secondary stone - canals, formation of, in 



Antedon rosacea, 557 

 Secondary trochoblasts, formation of, in 



embryo of Crepidula, 321 ; in embryo of 



Fiona, 321 ; in embryo of Patella, 297 ; 



in embryo of Phascolosoma, 375 



Secondary yolk pyramids, formation of, in 

 egg of Astacus, 183 



Segmentation-cavity, 165 



Segmentation of coelom of Asteriitu 

 472, 473 



Segmentation of the egg, definition of, 27 



Segmentation of the egg of Agelenu, 223 ; 

 of Amphioxus lanceolatus, 586, 587, 588 ; 

 of Antedon rosacea, 545 ; of Ascni-i* 

 megalocephala, 440-443 ; of Astacits, 179, 

 180 ; of Asterias, 460 ; of Aurelia <//> //'/, 

 68 ; of Balanoglossus daviyerus, 570 ; of 

 Beroe, 89-92; of Branch iptis, 194; of 

 Callidina russeola, 419-421 ; of C'ere- 

 brat.nl us lacteus, 119 ; of Cucumaria pland, 

 541 ; of Cynthia partita, 612-614 ; of 

 Dentalium, 326-328 ; of Loliclwylossus 

 pusil/ifs, 583 ; of Donacia and of Itori/- 

 phora, 246 ; of Dreissensia, 333-338 ; of 

 Echinus escnlentus, 506, 507 ; of Mu- 

 p/ianxia, 192 ; of Geryonidae, 67 ; of 

 Holothnria tubitlosa, 541 ; of Juius, 284 ; 

 of List's, 195 ; of Macrobwtus, 243 ; of 

 Membmnipora, 387 ; of Neiihelis, 160 ; 

 of <>pl, /',,f /i ,-/'.> frai/ilis, 486 ; of 1'allene, 

 243 : of Paludina, 310 ; of Patella, 292- 

 295 ; of PediceUina, 398 ; of Penpa/nx 

 capensis, 170 ; of Phascolosoma, 373-375 ; 

 of Planocera inqnilina, 104-109; of 

 Polygordius, 131-139 ; of Polyplienin.-i. 

 193 ; of Pyrosoma, 632 ; of Sagittn 

 />;/nmctata, 428, 429 ; of Salpa, 635 ; of 

 Scolopendra, 281 ; of the Scorpion, 239 ; of 

 Sepia, 354 ; of Sycandra raphnnus, 37, 

 38 ; of Synapta digitata, 530 ; of Tere- 

 /intti/Iiiia septentriiiiinlix, 408 ; of Ti'lm- 

 laria mese'inbryanthemmn, 54 ; of Urticina 

 crassicornis, 77 



Segmentation of mesoderm, cause of, in 

 Annelida, 165 



Segments, formation of, in embryo of 

 A ijelena, 225 



Sense-tentacle, formation of, in A urelia. 72 



Sensory-plate of larva of Asterias, 461 



Sepui ojliri/Kilis, 353, 354, 366 



Septa, formation of, in Can/npln/Ui/i I'l/nf/i/is. 

 87 



Septal funnels, formation of, in larva of 

 Ai'.'dia, 70 



Serosa, formation of, in embryo of Do)it.:!<i, 

 247 ; in embryo of iJuri/plmri/, 261 ; in 

 embryo of Lepisma, 265 ; in embryo of 

 Modules, 265 ; in embryo of the Scorpion, 

 240 



Serpulidae, 416, 520 



Ki'rtnlni-io, development of gonophore bud of, 

 62 



Sex-chromosomes, 13, 15 



Sexual germ, definition of, 2 



Shell, formation of, in Acmaea, 304 ; in 

 Dentalium, 329 ; in Dreissensia, 339 ; in 

 Fissure/la, 305 ; in Haliotis, 305 ; in 



357 



in Cyphonautes larva of 

 , 392 ; in Ifautilis, 357 ; 



