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INDEX 



SciuridcE, 658. 



Sciuropterus, 659. 



Sciurus, 643, 658. 



Sclerite, 330. 



Sclerotic, coat, 411, 412; plates, 587. 



Scolex, 163. 



Scolopendrella, 311. 



Scoly tides, 364. 



Scomber, 468, 469. 



Scomberomorns, 469. 



Scombrida, 444, 468. 



Scorpion, 24, 275, 377~379- 



Scorpionidea. 377-379. 



Screamer, 590, 603. 



Scrotal sacs, 640. 



Scutellum, 330. 



Scutigera, 311. 



Scutum, 330. 



Scyllium, 427. 



Scyphozoa, 108, 129-133. 



Sea, -anemone, 134 ; -bass, 444 ; -cow, 

 645, 673 ; -cucumber, 205-208 ; -horse, 

 444, 465 ; -lily, 190, 208 ; -lion, 643, 

 656; -squirt, 390; urchin, 189, 202; 

 walnut, 23, 145. 



Seals, 643, 657, 658. 



Secretion, 31 ; internal, 492. 



Segmentation, homonomous, 91 ; heter- 

 onomous, 91. 



Selachii, 428-430. 



Seminal receptacle, 217 (see reproduc- 

 tive system) . 



Seminal vesicle, 227 (see reproductive 

 system) . 



Sense organs, of Aurelia, 130, 131 ; cray- 

 fish, 285 ; Ctenophora, 145, 147, 148 ; 

 earthworm, 226; dogfish, 427; frog, 

 504-506; honey-bee, 321-322; lam- 

 prey, 418; mussel, 249; Nereis, 234; 

 perch, 440; pigeon, 587; rabbit, 640; 

 snail, 256 ; squid, 267 ; starfish, 197 ; 

 turtle, 533; vertebrates, 410-413. 



Septa, of coral polyp, 137 ; earthworm, 

 218. 



Septibranchia, 262. 



Serpentes, 538, 557-569, 6p4. 695- 



Serranida, 444, 465. 



Serricornia, 361. 



Serliilaria, 122, 128. 



Serum, 484. 



Setas, of earthworm, 216, 217; penial, of 

 Ascaris, 169, 171. 



Shag, 602. 



Shagreen, 424. 



Sharks, 428-429, 431. 



Shearwater, 600. 



Sheep, 667, 669, 684. 



Shells, of Brachiopoda, 185 ; mussel, 244 ; 



pigeon's eggs, 586; squid, 265, 266. 

 Shields, 528, 544. 

 Shrews, 642, 649, 650. 

 Shrike, 591. 

 Shrimp, 299, 301; fairy-, 293, 299; 



mantis-, 301. 

 Silenia, 262. 



Silpha, 361 ; Silphidce, 361. 

 Silurian, 697. 

 SiluridcE, 443, 457-458. 

 Simla, 644, 665 ; Simiida, 662, 664-666, 



696. 



Simplicidentata, 643. 

 Simuliida, 357. 



Sinus, 194, 282 (see circulatory system). 

 Sinus venosus, 438, 485 (see circulatory 



system) . 

 Siphon, of mussel, 244, 245, 247; of 



sea urchin, 203, 204; of Sycotypus, 



261. 



Siphonaptera, 337, 359-360. 

 Siphonoglyphe, 134, 135. 

 Siphonophora, 125, 129. 

 Si phono ps, 510. 

 Siphuncle, 268, 269. 

 Sipunculoidea, 187; Sipitnculus, 187. 

 Siren, 477, 511, 514; Sirenida, 511, 514. 

 Sircnia, 645, 673-674. 

 Sistrurus, 569. 

 Sittida, 591. 

 Skates, 429, 430. 

 Skeleton, 78, 403; dogfish, 424; fish, 



449; frog, 492-407; lamprey, 416; 



perch, 434-437 ; pigeon, 579; rabbit, 



634-637 ; sea-urchin, 202, 203 ; 



sponges, 99, 101 ; starfish, 191, 192, 



195 ; turtle, 528. 

 Skimmer, 607, 609. 

 Skin, 479. 

 Skink, 538, 557. 

 Skipper, 35, 35i- 

 Skua, 608. 

 Skunk, 643, 655. 

 Skull, 312, 403 (see skeleton). 

 Sloth, 643, 661. 

 Smell (see sense organs). 



