INDEX. 



613 



Scenopius, 576. 



Schaeffer, 133. 



Schattenmiicke, 578. 



Sehelling, 137. 



Schildlause, 568. 



Schildwanzen, 572. 



Schistocephalus, 338. 



Schizaster, 297. 



Schizomycetes, 206. 



Schizoneura, 570. 



Schizopoda, 472. 



Schizoprora, 311, 313, 

 314. 



Schizostomum, 312. 



Schnabeltliegen, 563, 



Schnaken, 578. 



Sclmepfenfliegen, 577. 



Sehreitwanzen, 572. 



Schwarmer, 584. 



Schwebfliegen, 576. 



Sciara, 57g. 



Sciophila, 578. 



Sclater on Zoological 

 Provinces, 160. 



Sclerodermites, 231. 



Sclerostoraum, 350, 352. 



Sclerotic, 88. 



Scolex, 333. 



Scolia, 596. 



Scolopcndra, 519. 



Scopula, 582. 



Scorpion, 510. 



Scorpionidea, 508. 



Scorpion-spiders, 506. 



Scuta of Cirripedia, 439. 



Scutellidas, 297. 



Scutellum, 526. 



Scutigera, 518, 520. 



Scyllarus, 477. 



Scyphistoma, 125, 233 

 255. 



Scyphomedusae, 231 , 236, 

 250. 



Sea feathers, 231. 



Sea long-worm, 343. 



Sea-urchins. 294 ; Regu- 

 lar, 296. 



Sebaceous glands, 77. 



Secretory organ*, 74. 



Sedentaria, 380. 



Sedimentary forma- 

 tions : 



Conditions of forma- 

 tion of, 166, 169. 

 Determination of age 



of, 164. 

 Table of, 165. 



Segment, 27. 



Segmental organs,75,308. 



Segmentation cavity, 

 116, 



Segmentation of ovum, 

 110. 



Selection, Artificial, 145. 



Selection, Sexual, 152. 



Semseostomeas, 260. 



Semen, 97. 



Semitse of Echmoidea , 

 296. 



Sense organs, 83, 



Septa of Actinozoa, 228. 



Sergestes, 477. 



Scricteria, 532. 



Serolis, 460. 



Serpula, 382. 



Sertularia, 242. 



Sesia, 584. 



Sex, 104. 



Sexual reproduction, 97. 



Sexual selection, 152. 



Sheeptick, 575. 



Shell glands, 75. 



Shell glands, Crustacea, 

 410. 



Sialis, 563. 



Sida, 422. 



Silkworm, 584. 



Silpha, 590. 



Simonea, 492. 



Simple eye, 89. 



Simulia, 577. 



Singcicaden, 571. 



Singmiicke, 578. 



Siphonophora, 236, 243. 



Siphonostomata,, 435. 



Sipunculoidea, 392. 



Sipunculus, 394. 



Sirex, 594. 



Siriella, 474. 



Sitaris, 589. 



Skeleton, 78. 



Smellers of Tanaidae, 

 459. 



Smerinthus, 584. 



Smynthurus, 554. 



Solaster, 293. 



Solenobia, 543, 581, 582. 



Solifugse, 511. 



Solpuga, 512. 



Spanish fly, 589. 



Spatangidae, 296, 279, 

 295. 



Spatangidea. 273. 297. 



Spatangus, 297. 



Species, 140. 



Species : Cuvier's defi- 

 nition of, 149; Muta- 

 bility of, 144 ; Origin 

 of, 144, 149. 



Species, Relation of to 

 '_ r ''nera. 149. 



Speckkafer, 590. 



I Sperm, 97. 



' Spermatophores, 99. 



Spermatozoon, 33, 97. 



Sphaeridia, 272. 



Sphaarodorum, 372, 379. 



Sphnsroma, 460. 



SpliEerouectes 250. 



Sphseronitcs, 289. 



Sphaerophyra, 205. 



Sphserotherium, 521. 



Sphasrozoum, 191. 



Sptuerularia, 356. 



Sphex, 552, 596. 



Sphingina, 584. 



Sphinx, 584. 



Sphyrocephalus, 311. 



Spicula of Nematoda. 

 347. 



Spiders, 498. 



Spindle-tree moth, 382. 



Spinning glands, 532. 



Spinning mite, 495. 



Spio, 382. 



Spiodeae, 381. 



Spio-Nephthys larva, 

 378. 



Spionidnc, 381. 



Spiralzooids, 241. 



Spirillum, 206. 



Spirochasta, 206. 



Spirographis, 382. 



Spiroptera, 348. 



Spirorbis, 372, 382. 



Spirostomum, 205. 



Sponges calcareous, 222 ; 

 glassy, 221 ; gelatin- 

 ous, 221; horny, 222 ; 

 levantiue, 221. 



Sponge type, 210. 



Spongia, 221. 



Spongiadas, 221. 



Spongiaria, 214. 



Spongilla, 218, 221. 



Spontaneous generation, 

 10. 



Spores, 97. 



Spores 128; of Treraa- 

 toda, 129. 



Sporocyst, 129, 319. 



Spring-flies 561. 



Springkiifer, 589. 



Spring-tails, 5,31. 



Spumella, 195. 



Squama, 572. 



Squilla, 472. 



Stag-beetle, 689. 



Staphylinus, 590. 



Star coral, 232. 



Star-lislu's, 290. 292. 



Stauridae, 230. 



Staurocephalus. 379. 



