966 



INDEX 



Sense organs of Helix, 439. 



of Hirudo, 273. 



of Holothurian, 307. 



of Insects, 389. 



of Lamprey, 582. 



of Peripatus, 363. 



of pigeon, 746. 



of rabbit, 800. 



of scorpion, 414. 



of Sepia, 460. 



of skate, 600. 



of spider, 419. 



of starfish, 293. 



of Vertebrates, 547. 



Sensitiveness in plants and animals, 23. 



— in Protozoa, 136. 



Sepia, 230, 455, 456, 459, 463, 482, 486, 



488. 

 Sepiostaire, 458. 

 Seps, 701. 

 Sergestes, 353. 

 Serpents, 703. 

 Serpula, 268. 

 Serranus, 548, 628. 

 Sertularians, 204. 

 Sesamoid bones, 538, 796. 

 Sesarma, 350. 

 Sesarmaxenos, 350. 

 Seta;, 247, 322. 

 Sex, evolution of, 62. 

 Sexual selection, 913. 



among birds, 760. 



Insects, 394. 



■ — spiders, 422. 



Mammals, 830. 



— reproduction, 60. 



divergent modes of, 64. 



Shagreen, 609. 

 Sharks, 6, 609, 633. 

 Sheep, skull of, 849. 



— stomach of, 850. 

 Shell of Anodonta, 446. 



— of Argonauta, 483. 



— of Cephalopoda, 482, 483, 487. 



— of Chiton, 471. 



— of Helix, 437, 437. 



— of Molluscs, 437, 469. 



— of Nautilus, 483. 483. 



— of Scaphopoda, 478. 



— of Spirula, 486. 



Shell gland or sac, 340, 356. 



Shore-crab, 353. 



Shrews, 876. 



Shrimp, 353. 



Sicula, 205. 



Sida, 340. 



Silicispongiae, 164. 



Silk-moth, life-history of, 399. 



Simla, 885, 887. 



Simiidae, 885. 



Simplicidentata, 783, 867. 



Sinews, 29. 



Sinus venosus, 561. 



Siphon of Cephalopods, 482. 



— of Gasteropods, 476. 



— of Laniellibranchs, 480. 



Siphonaptera, 406. 

 Siphonoglyph, 193. 

 Siphonophora, 180, 184, 205. 

 Siphonops, 680. 

 Siphonozooid, 200. 

 Siphuncle of Nautilus, 483. 

 Sipunculidae, 11, 244, 282. 

 Sipunculus, 282. 

 Siredon, 681. 

 Siren, 680. 

 Sirenia, 845, 865. 

 Skate, 6, 589, 633. 



— development of, 607. 



— nerves of, 596. 



— vascular system of, 602, 603 



— young, 633. 



Skeleton of Amphioxus, 517. 



— of Balanoglossus, 491. 



— of bat, 877, 879. 



— of Birds, 726. 



— of Chelonia, 688. 



— of crayfish, 321. 



— of Crinoids, 312. 



— of Crocodilia, 710. 



— of dogfish, 613. 



— of frog. 653, 656. 



— of haddock, 617. 



— of Holothurian, 306. 



— of Lizards, 694. 



— of Mammals, 7S7. 



— of Myzine, 576. 



— of Petromyzon, 581. 



— of pigeon, 737. 



— of rabbit, 787. 



— of sea-urchin, 303. 



— of Sepia, 458. 



— of skate, 591, 594. 



— of Snakes, 704. 705 



— of sponges, 158. 



— of starfish, 292. 



— of Vertebrates, 532. 

 Skin, function of, 35. 

 Skin of Amphioxus, 517. 



— of Anodonta, 448. 



— of Arenicola, 258. 



— of Balanoglossus, 490, 



— of Birds, 736. 



— of cockroach, 373. 



— of crayfish, 321. 



— of Crocodilia, 710. 



— of dogfish, 609. 



— of earthworm, 248. 



— of Fishes, 588. 



— of frog, 652. 



— of haddock, 617. 



— of Helix, 438. 



— of Insects, 388. 



— of Leech, 273. 



— of Lizards, 694. 



— of Mammals, 812. 



— of Myxine, 575. 



— of Peripatus, 362. 



— of Petromyzon, 581. 



— of rabbit, 786. 



— of Sepia, 457. 



— of skate, 590. 



