INDEX. 



613 



Scenopius, 576. 



Schaeffer, 133. 



Schattenmlicke, 578. 



Schelling, 137. 



Schildlause, 568. 



Schildwanzen, 572. 



Schistocephalus, 338. 



Schizaster, 297. 



Schizomycetes, 206. 



Schizoneura, 570. 



Schizopoda, 472. 



Schizoprora, 311, 313, 

 314. 



Schizostomum, 312. 



Schnabelfliegen, 563. 



Schnaken, 578. 



Schnepfenfliegen, 577. 



Sohreitwanzen, 572. 



Schwarmer, 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, 510. 



Scorpionidea, 508. 



Scorpion-spiders, 506. 



Scuta of Cirripedia, 439. 



Scutellidfe, 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 organs, 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. 



Semaeostomeae, 260. 



Semen, 97. 



Semites of Echinoidea , 

 296. 



Sense organs, 83. 



Septa of Actinozoa, 228. 



Sergestes, 477. 



Sericteria, 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. 



Singmucke, 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. 



Solifugas, 511. 



Solpuga, 512. 



Spanish fly, 589. 



Spatangidse, 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, Kelation of to 

 genera. 149. 



Speckkafer, 590\ 



Sperm, 97. 



Spermatophores, 99. 



Spermatozoon, 33, 97. 



Sphaeridia, 272. 



Sphjerodorum, 372, 379. 



Sphasroma, 460. 



SphaBronectes 250. 



Sphasronites, 289. 



Sphaarophyra, 205. 



Sphasrotherium, 521. 



Sphasrozoum, 191. 



Sphaerularia, 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. 



Spiodeas, 381. 



Spio-Nephthys larva, 

 378. 



Spionidas, 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; 

 levantine, 221. 



Sponge type, 210. 



Spongia, 221. 



Spongiadae, 221. 



Spongiaria, 214. 



Spongilla, 218, 221. 



Spontaneous generation, 

 10. 



Spores, 97. 



Spores 128; of Trema- 

 toda, 129. 



Sporocyst, 129, 319. 



Spring-flies 564. 



Springkiifer, 589. 



Spring-tails, 554. 



Spumella, 195. 



Squama, 572. 



Squilla, 472. 



Stag-beetle, 689. 



Staphylinus, 590. 



Star coral, 232. 



Star-fishes, 290. 292. 



Stauridae, 230. ' 



Staurocephalus, 379, 



