716 



INDEX. 



Species, origin of, G73 



variation of, 10, GT3, G73 

 Spermaceti, 593 

 Spermatozoa, formation of, 044 

 Spliaerodorum 231 

 Sphargis coriacea, 510 

 Splienodon, 511 

 SpUeotyto cunicularia, 549 

 Sphex iclineumonea, 3S3 

 Sphinx, 379 

 Spiders, 8G3 

 Spinalis Gouldii, 359 

 Spirula Peronii, 381 

 Spliyrna zygaeua, 431 

 Spirorbis, 337 

 Spirostreplion Copei, 350 

 Sponges, 43 



usef al, 49 

 Spongia adriatica, 49 



equina, 49 



gossypina, 49 



tubulifera, 49 

 Spongilla, 47 

 Spoonbill fisli, 438 

 Sporocyst of Nematodes, 151 

 Spring-tails, 304 

 Squalus Americauus, 430 

 Squamella oblonga, 170 

 Squid, anatomy of, 373 

 Squilla, 313 

 Squirrels, flying, 583 

 Star fisb, 90, 109, 111 



anatomy of, 93 

 Star worm, 331 

 Statoblast, 187 

 Stegocepbala, 483, 488 

 Stcller's manatee, 590 

 Stentor polymorph us, 36 

 Sternum of insects, 329 

 Stick insect, 077 

 Sticklebacli, 456 

 Stilt, 540 

 Sling rays, 434 

 Stomapoda, 313, 835 

 Stone lilies, 101 

 Strobila of Hydrozoa, 00 



Strobila of planarians, 144 



tape worms, 150 

 Strobilation in worms, 144, 145, 



234 

 Struggle for existence, 073 

 Strutliio camelus, 539 

 Sturgeon, embryology of, 437 

 Sturgeon, 437 



shovel-nose J, 437 

 Stygicola dentata, 459 

 Stylaster, 58 

 Styliola vitrea, 358 

 Styloclius elliptica, 144 

 Stylops, 373, 374 

 Sucker, 453, 454 

 Suctoria, 40 

 Sun fish, fresh water, 455 



banded, 455 



spotted, 450 



salt water, 403 

 Swimming, in fislies, 444 

 Sycandra, 44 

 Sycon ciliatum, 45 

 Syllis, 335 



Symmetry, bilateral, in cteno- 

 phores, 93, 93 



echinoderms, 130 

 Synapta, 134, 135 

 Syngnathus peckianus, 401 

 Synthetic types, 483, 679 

 Syrinx, 530, 553 

 Syruium cinereum, 549 

 Syrphus, 375 



Tabulate corals, 58 



Tachina, 375 



Taenia acanthotrias, 157 



bacillaris, 155 



cnenurus, 100, 161 



echinococcus, 158 



mediocanellata, 158 



solium, 155, 157 

 Taeniata, 95 

 Tape worms, development of, 154 



structure of, 153 

 Tardigrades, 301 



