INDEX. 



613 



Scenopius, 576. 

 Schaeffer, 133. 

 Schattenmiicke, 578. 

 Schelling, 137. 

 Schildlause, 568. 

 Schildwanzen, 572. 

 Schistoeephalus, 338. 

 Schizaster, 297. 

 Sehizomycetes, 200. 

 Schizoneura. 570. 

 Schizupoda. 172. 

 Schizoprora, 311, 313, 



314. 



Schizostomum, 312. 

 Schnabelfliegen, 563. 

 Sehnaken, 578. 

 Schnepfenfliegen, 577. 

 Schreitwanzen, 572. 

 Sch warmer, 584. 

 Schwebfliegen, 576. 

 Sciara, 57g. 

 Sciophila, 578. 

 Sclater on Zoological 



Provinces. 160. 

 Sclerodermites, 231. 

 Sclerostomum, 350, 352. 

 Sclerotic, 88. 

 Scolex, 333. 

 Scolia, 596. 

 Scolopendra, 519. 

 Scopula, 582. 

 Scorpion, 10. 

 Scorpioniaea, 508. 

 Scorpion-spiders, 506. 

 Scuta of Cirripedia, 439. 

 Scutellidae, 297. 

 Scutdhmi, 526. 

 Scutigera, 518, 520. 

 Scyllarus, 477. 

 Scyphistoma, 125, 233 



255. 

 Scyphomedusse, 23 1,236, 



250. 



Sea feathers, 231. 

 Sea long-worm, 343. 

 Sea-urchins. 294 ; Regu- 

 lar, 296. 



Sebaceous glands, 77. 

 Secretory organs, 74. 

 Sedentaria, 380. 

 Sedimentary forma- 

 tions : 



Conditions of forma- 

 tion of, 166, 109. 

 Determination of age 



of. 164. 

 Table of, 165. 

 Segment, 27. 

 Segmental organs,75,308. 

 Segmentation cavity, 

 110. 



Segmentation of ovum. 

 110. 



Selection, Artificial, 145. 



Selection, Sexual. 152. 



Semseostomese, 260. 



Semen, 97. 



Semitae of Echinoidea , 

 290. 



Sense organs, 83. 



Septa of Actinozoa, 228. 



Sergestes, 477. 



Sericteria, 532. 



Scrolls, 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. 503. 



Sida, 422. 



Silkworm, 584. 



Silpha, 590. 



Simonea, 492. 



Simple eye, 89. 



Simulia, 577. 



Singcicaden, 571. 



Siugmiicke, 578. 



Siphonophora, 236, 243. 



Siphonostomata., 435. 



Sipunculoidea, 392. 



Sipunculus. 394. 



Sircx. 594. 



Siriella, 474. 



Sitaris, 589. 



Skeleton, 78. 



Smellers of Tanaidae, 

 459. 



Smeriuthus, 584. 



Smynthurus, 554. 



Solaster, 293. 



Solenobia, 543, 581, 582. 



Solifugse, 511. 



Solpuga, 512. 



Spanish fly, 589. 



Spatangidae. 290, 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 



genera. 149. 

 Speckkafer, 590. 



Sperm, 97. 

 Spermatophores, 99. 

 Spermatozoon, 33, 97. 

 Sphteridia, 272. 

 Sphterodorum, 372, 379. 



Sphferoma, 400. 



Sphgeronectes 250. 



Sphasrouites, 289. 



Sphasrophyra, 205. 



Sphaerotherium, 52 1 . 



Sph<erozoum, 191. 



Sphierularia. 350. 



Sphex, 552, 596. 



Sphingina, 584. 



Sphinx, 584. 



Sphyroccphalus, 311. 



Spicula of Nematoda, 

 347. 



Spiders, 498. 



Spindle-tree moth, 382. 



Spinning glands, 532. 



Spinning mite, 495. 



Spio, 382. 



Spiodeas. 381. 



Spio-Nephthys larva. 

 378. 



Spionidaj, 381. 



Spiralzooids, 241. 



Spirillum, 206. 



Spirochta, 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. 



Spougilla, 218, 221. 



Spontaneous generation, 

 10. 



Spores, 97. 



Spores 128 ; of Trema- 

 toda, 129. 



Sporocyst, 129. 319. 



Spring-flies 564. 



Spriugkiifer, 589. 



Spring-tails, 554. 



Spumella. 195. 



Squama, 572. 



Squilla. 472. 



Stag-beetle. 589. 



Staphylinus, 590. 



Star coral, 232. 



Star-fishes, 290, 292. 



Stauridse, 230. 



Staurocephalus. 379. 



