

INDEX 



729 



Smilisca, 519. 



Snail, 253-257. 



Snakes, 527, 536, 538-539, 557-569J 



Congo, 514; horsehair, 179. 

 Snipe, 590, 607. 

 Sole, 469. > 



Solen, 262. 

 Solenodontidce, 650. 

 SolifugcE, 382. 

 Somatic, cells, 46, 47, 73; mesoderm, 



57- 



Somite, 90. 

 Songs of birds, 621. 

 Sorex, 642, 649, 650 ; Soricida, 649. 

 Sparrow, 593, 615. 

 Spatangus, 190. 

 Species, 22, 23. 

 Spelerpes, 511, 517-' 

 Spermatheca, 226, 227 (see reproductive 



system). 

 Spermatid, 81. 

 Spermatocytes, 81. 

 Spermatogenesis, 81-82. 

 Spermatogonia, 81. 

 Spermatozoa, 47, 75, 81. 

 Sphtzrodactylus, 537, 552. 

 Sph&rophyra, 65. 

 Sphargis, 544- 

 Sphegida, 364, 367. 

 Sphenethmoid, 493, 494. 

 Spheniscus, 589; Sphenisciformes, 589, 



598. 



Sphenodon, 536, 546, 695. 

 Sphingida, 352; Sphinx, 335. 

 Sphyranura, 161. 

 Sphyrna, 429. 



Spicules, of sponges, 93, 95, 99, 191. 

 Spiders, 24, 37i~377- 

 Spilogale, 655. 

 Spinal cord, 408, 503-504 (see nervous 



system) . 

 Spinal nerves, 503, 504 (see nervous 



system) . 

 Spines, of echinoderms, 190, 201, 292; 



haemal, 436; of perch, 435. 

 Spinneret, 373, 376. 

 Spiracle, insects, 319, 320; Squalus, 424; 



tadpole, 510. 



Spiral valve, 418, 423, 425. 

 Spireme, 15. 

 Spirobolus, 310. 

 Spirorbis, 236. 



Spirostomum, 63. 



Spittle insects, 346. 



Splanchnic mesoderm, 507. 



Spleen, 451; frog, 492 ; perch, 438; ver- 

 tebrates, 401, 402. 



'Sponges, 23, 92-107. 



Spongilla, 98, 98, 100. 

 -Spongin, 99, 101. 



Spongoblasts, 100. 



Spontaneous generation, 12. 



Spores, 48, 49. 



Sporoblast, 49, 50. 



Sporocyst, 159, 160. 



Sporozoa, 27, 48-53. 



Sporozoites, 49, 50. 



Sporulation, 33. 



Springtails, 337, 338. 



Squall, 428. 



Squalus, 422-428. 



Squamata, 527, 536, 550-569, 694, 695. 



Squamosal, 493, 494. 



Squid, 264-267. 



Squilla, 298, 299, 301. 



Squirrel, 643, 658, 659. 



StaphylinidcE, 361. 



Starfish, 24, 189, 190-199. 



Starling, 591. 



Statocyst, 286 (see sense organs). 



Statolith, 286 (see sense organs). 



Stauromedusa, 132, 133. 



Staurotypus, 535. 



Stegocephalia, 525, 526, 694, 695. 



Stegomyia, 356. 



Stegosaurus, 572, 573. 



Stenopus, 297. 



Stentor, 64. 



Stercoral pocket, 373, 374. 



Stereolepis, 466. 



Sternothoerus, 535. 



Sternum, 276, 372, 495, 496 (see skele- 

 ton). 



Stickleback, 444, 464. 



Stigma, 42, 43. 



Stigmata, 378, 379. 



Stilt, 607. 



Sting, 317. 



Stolonifera, 139, 140. 



Stomach, cardiac, 480; pylori c, 481 (see 

 digestive system). 



Stomato-gastric ganglion, 321. 



Stomatopoda, 297, 298. 



Stomias, 473. 



