INDEX. 627 
PAGE PAGE 
Skull - 416 | TADPOLE oF FRoc 356 
Skunk 583 | Tenia - 144 
Sloths 558 | Tails of fishes 435 
Sloth, as arboreal type 533 | Talpa 537 
Snail (see Helix) 262 | Tamandua - 558 
Snakes 442 | Tape-worms 144 
Species 80 | Tapir- 572 
Spermatozoa 43 | Tarsius 558 
Sphenethmoid 348 | Tarsus 420 
Sphenodon 441 | Tarso-metatarsus 375 
Sphincter muscles 16 | Tasmanian wolf - 502 
Spicule 99, 104, 125 Teeth of mammals 460 
Spiders Teleostei - 438 
Spider, as a type of Ar ach- Teleostomi 437 
nida - 233 | Telolecithal - 49 
Spider Monkeys - 590 | Temperature of birds - 465 
Spinal nerves 408 | Temporal (see Squamosal) 416 
Spiracle of skate 314 | Tenrec - - 586 
Spiracular cartilage 325 | Tentaculocysts 128 
Spiral valve - 315 | Teredo - 284 
Sponge, development of a 106 | Terrestrial fauna 61 
Sponges 107 | Test of Ascidian 289 
Spongilla 110 | Tetrabranchiata 285 
Sporocyst 142 | Thalamencephalon 406 
Sporozoa 102 | Thaldssicola - 100 
Squamosal - 416 | Thread cells=Stinging cells 115 
Squirrels 565 | Thread-worms (Nematoda)- 155 
Starfish 156 | Thylacinus 502 
Steller’s sea-cow - 562 | Thymus 425 
Sternum of Vertebrata 418 | Thyroid 425 
" Mammals - 471 | Tibia - 419 
Stigmata 228, 258, 290 | Tibio-tarsus 375 
Stinging cells 114 | Tiger - 581 
Stone canal of starfish 160 | Tissues 31 
Struggle for existence - 82 | Toads 440 
Struthio 452 | Tornaria 165 
Sturgeon - - - 437 | Tortoises - 444 
Sub-neural — gland of Trabeculz of skull 415 
Ascidian - 292 | Trachez 229 
Sudorific glands - 455 | Tragulidee 575 
Suidz - 575 | Tragulus 576 
Sun animalcules - 99 | Trematoda - 149 
Sus - 575 | Trichechidze 584 
Swim- bladder (air- Binder) 2 437 | Trichina 155 
Sycandra - 103 | Trichocysts go 
Sycon type (of sponge) 108 | Trochanter 474. 
Symbiosis. 74 | Trochlear nerve - 407 
Symmetry of animals 22 | Trochophore 181 
Sympathetic nervous system 347 | Truncus arteriosus 345 
Syrinx 368 | Tunicata —>~ 403 
