INDEX. 



719 



Solitaire, 547 



Somateria moUissima, 543 



Somite, 266 



Sorex platyrliinus, 687 



Sounds produced by insects, 349 



Sounds, fishes', 443 



Spalax, 586 



Sparrow, 555 



Spatangus, 134 



Specialization, 6 



Species, origin of, 673 



variation of, 10, 673, 673 

 Spermaceti, 593 



Spermatozoa, formation of, 644 

 SpliEerodorum, 231 

 Spliargis coriacea, 510 

 Splieuodon, 511 

 Splieotyto cunicularia, 549 

 Spliex iclineumonea, 363 

 Spliinx, 359 

 Spiders, 342 

 Spirialis Gouliiii, 339 

 Spirula Peronii, 261 

 Sphyrna zygaena, 421 

 Spirorbis, 237 

 Sponges, 42 



silicious, 47 



useful, 49 

 Spongia adriatica, 49 



equina, 49 



gossypina, 49 



tubulifera, 49 

 Spongilla. 47 

 Spoonbill fish, 428 

 Sporocyst of Nematodes, 151 

 Spriug-tiiils, 344 

 Squalus Americanus, 430 

 Squamella oblonga, 176 

 Squid, anatomy of, 273 

 Squilla, 293 

 Squirrels, flying, 583 

 Star-flsb, 96, 109, 111 



anatomy of, 96 

 Star worm, 221 



Statoblast, 187 

 Stegocephala, 482, 488 

 Steller's manatee, 596 

 Stentor polymorphus, 36 

 Sternum of insects, 309 

 Slick insect, 677 

 Stickleback, 456 

 Stilt, 546 

 Sting rays, 424 

 Stomapoda, 292, 305 

 Stone lilies, 101 

 Strobila of Hydrozoa, 66 

 Strobila of Planarians, 144 



tape-worms, 156 

 Strobilation in worms, 144, 145 

 Struggle for existence, 673 

 Strulhio camelus, 539 

 Sturgeon, embryology of, 437 

 Sturgeon, 427 

 Stygicola dentata, 459 

 Slylasler, 58 

 Styliola vitrea, 338 

 Stylochus elliptica, 143 

 Stylocordyla, 48 

 Stylops, 353, 354 

 Sucker, 453, 454 

 Suctoria, 40 

 Sun-fish, fresh water, 455 



banded. 455 



spotted, 456 



salt-water, 463 

 Swimming, in fishes, 444 

 Syciindra, 44 

 Sycon ciliatum, 45 

 Syllis, 235 



Symmetry, bilateral, in cteno- 

 phores, 93, 93 



echinoderms, 120 

 Symphyla, 344 

 Synapta, 134, 135 

 Syncarida, 273 

 Syngnathus peckianus, 461 

 Synthetic types, 483, 679 

 Syrinx, 536, 552 



