INDEX. 



Sea squills, vide Tunicata 



,, urchin, 

 Seals, .... 

 Sebaceous glands, . 

 Sedentaria, 

 Segmental duct of Vertebrates, 



,, Organs, 



,, Papilte, 

 Segmentation of Ovum, . 



,, in Amphioxus, . 



,, Anodonta, 



„ Ascidian, 



,, Balanoglossus, 



,, Birds, 



,, CliKtognatha, 



„ Crustacea, 



„ Dipnoi, . 



„ Earthworm, . 



,, Echinoderms, 



„ Fowl, 



Frog, . 



,, Ganoids, 



,, Gasteropoda, . 



,, Haddock, 



,, Hydra, . 



,, Insects, . 



,, Lamprey, 



„ Monotremata, 



,, Placental Mammal: 



„ Reptilia, 



„ Scorpion, 



„ Skate, 



„ Spider, . 



,, Teleosteans 



„ Vertebrata, 



Seison, . 



Selachii = Elasmobranchs, 

 Selachodichthyidje, 

 Selachoidei, . 

 Selection, 

 Selenodont, . 

 Self-fertilisation in Hydra, 

 ,, in Serranus 



,, in Tapeworms, 171 



,, in Trematoda, 164 



Sella turcica, .... 

 Semicircular canals of Ear, 

 Seminal vesicle, . .21 

 Semnopithecina;, . 

 Semnopithecus, 



. 401 

 236-40 

 716 

 642 

 210 

 462 

 194 

 215 

 63 

 417 

 370 

 407 



396 

 613 

 222 

 281 



513 

 194 

 247 

 613 



549 

 508 



356 

 503 

 139 

 319 

 472 



561 

 330 

 493 

 333 

 503 

 463 

 223 



505 

 528 

 506 

 769 

 693 

 138 

 463 



663 

 444 

 . 677 

 726 

 726 



Sense organs of — 



Amphioxus, 



Anodonta, 



Ascidian, 



Aurelia, . 



Crayfish, 



Crocodilia, 



Crustacea, 



Frog, 



Haddock, 



Hagfish, . 



Helix, . 



Hirndo, . 



Holothurian, 



Insects, . 



Lamprey, 



Limulus, 



Pigeon, . 



Rabbit, . 



Scorpion, 



Sea-urchin, 



Sepia, 



Skate, . 



Spider, . 



Starfish, . 



Vertebrates, 

 Sepia, 

 Sepiostaire, 

 Seps, 



Septibranchia, 

 Sergestes, 

 Serpents, 

 Serpula, 

 Serranus, 

 Sertularians, . 

 Sesamoid bones, 

 Setce, 



Sex, . . 

 Sexual selection, 



,, selection among 



241 



3" 

 470 

 29s 

 607 

 669 

 329 

 237 

 379 

 186-7 

 332 

 231 



443 

 375. 386 



Birds, 



52-53 

 770 

 626 



among Spiders, 334 

 ,, reproduction, . . 50 



,, Divergent modes of 



sexual reproduction, 54-56 

 Sharks, .... 506 



Shell of— 



Anodonta, . . . 364 



Argonauta, . . . 386 

 Cephalopoda, . . . 375 



Chiton, .... 346 



