INDEX. 



843 



Solipedia (see Solidvngula). 



Solitaire, 618. 



Solpugidce, 323. . 



Somateria, 606. 



Somatic cavity, of Caelenterata, 106, 107 ; 



of Hydrozoa, 106, 109 ; of Hydra, 113 ; 



of Actinozoa, 107, 151. 

 Somatocyst, 131. 

 Somite, 274; of Crustacea, 279 ; of Arach- 



nida, 315. 

 Sorex. 768. 

 Soricidce, 768, 771. 

 Spalacidw, 757. 

 Spalacotherium, 654. 

 Spalax, 757. 

 Sparrows, 626. 

 Spatularia, 489, 490, 494. 

 Species, definition of, 27, 28; origin of, 



47-50. 



Spectacled Bear, 740. 

 Spermatophores, 422. 

 Spermophilus, 760. 

 Sperm-whale, 688. 

 Sphseridia, 196. 

 Sphcerogastra, 325. 

 Sphceroma, 305. 

 Sphcerozoum, 80. 

 Sphcerularia, 244. 

 Sphagodus, 506. 

 Sphargis, 535. 

 Spheniscidce, 601. 

 Spheniscus, 602. 

 Sphenodon, 553. 

 Sphingurus, 756. 

 Spicula, of Sponges, 87, 88, 89, 90 ; of Jta- 



diolaria, 78. 80 ; of Actinozoa, 157, 166, 



167, 168, 169, 170. 

 Spider-crab, 310, 311. 

 Spider-mites, 322. 

 Spider-monkey, 777. 



Spiders, 314, 315, 316, 317, 325, 326, 327. 

 Spinax, 496, 497. 

 Spinnerets, of Spiders, 326; of Caterpillars, 



328. 



Spio, 108. 

 Spin/era, 394. 

 Spiriferidce, 394, 395. 

 Spirillinidea, 74. 

 Spirorbis, 265, 266, 271. 

 Spirula, 425, 429, 435. 

 Spirulidce, 429. 

 Sponge-crab, 311. 

 Spongia, 87. 

 Spongida, 83 ; skeleton of, 87, 88 ; sarcoids 



of, 84, 85 ; aquiferous system of, 86 ; 



reproduction of, 90; development of, 



91 ; classification of, 93 ; distribution 



of, in space, 92 ; in time, ib. 

 Spongilla, 87, 90, 92; reproduction of, 



90. 



Spoon-bill, 611. 

 Spoon-worms, 254, 255. 

 Sporosac of Corynida, 115. 

 Spring-tails, 346. 

 Squalidce, 499. 

 Squalodon, 691, 692. 

 Squamata (Reptilia), 528. 

 Squamulinidea, 74. 

 Squids, 429. 

 Squitta, 306. 

 Squirrel, 759. 

 Squirrel Monkey, 777. 



Staggers of Sheep, 235. 



Stagonolepis, 558. 



Staphylinidce, 362. 



Starlings, 625. 



Star-nosed Mole, 767. 



Statoblasts, 35, 377. 



Stauria, 173, 175, 185. 



Stauridce, 175, 185. 



Stauridia, 118. 



Steatornis, 629. 



Steganophthalmata (Medusae), 127, 128, 



137, 138, 140, 144. 

 Stellerida, 201. 

 Stellio, 550. 



Stem-muscle of Vorticella, 98. 

 Stemmata (see Ocelli). 

 Stenaster, 223. 

 Steneofiber, 760. 

 Steneosaurus, 558. 

 Stenops, 774. 

 Stenostomata, 179, 180. 

 Stentor, 16, 99, 100. 

 Stephanoceros, 248, 251. 

 Stephanoscyphus, 127. 

 Sterelmintha, 237. 

 Stereognathus, 653, 669. 

 Sternum, of Crustacea, 279 ; of Arach- 



nida, 315 ; of Chelonia, 353 ; of Aves, 



578 ; of Mammalia, 642. 

 Stick-insects, 350. 

 Stigmata, of Physophoridce, 135 ; of 



Leeches, 260; of Arachnida, 318; of 



Insecta, 339. 

 Sting-rays, 500. 

 Stolons, of Foraminifera, 70 ; of social 



Tunicata, 386. 



Stomapoda, 283 ; characters of, 306 ; de- 

 velopment of, ib. ; distribution of, in 



time, 314. 



Stomatodendra, 142, 143. 

 Stone-chat, 627. 

 Stone-flies, 351. 

 Stork, 611. 

 Strepsilas, 611. 

 Strepsiptera, 335, 360, 361. 

 Strepsirhina, 772, 773. 

 Streptospondylus, 558. 

 Strigidce, 630. 

 Strigops, 621. 

 Strix, 631. 

 Strobila, of Rhizostomidce, 140 ; of Tceni- 



ada, 233, 234. 

 Stromatopora, 76. 

 Strombidce, 368, 406, 412. 

 Strombodes, 175. 

 Strongylocentrotus, 194. 

 Strophomenidce, [394, 395. 

 Struthio, 596. 

 Struthionidce, 596. 

 Sturgeon, 470, 493. 

 Sturionidce, 493, 494. 

 Sturnidce, 625. 

 Stylaster, 149. 

 Stylasteridce, 147. 

 Stylinodontia, 725. 

 Stylops, 360. 

 Sub-brachiata, 486. 

 Sub-kingdoms, 21. 

 SfoZmto, 716. 

 Suchosaurus, 558. 

 Suctoria (Infusoria), 94, 95, 99. 

 , 705, 722. 



