INDEX 



289 



Skeleton of Birds, 240 



of Crocodilia, 240 

 of Cyclostomata, 216 

 of Dogfish, 220 

 of Pishes, 217 

 of Frog, 234, 235 

 of Heliozoa, 30 

 of Pigeon, 243 

 of Rabbit, 252-254 

 of Radiolarians, 35 

 of Reptiles, 239 

 of Skate, 220 

 of Sponges, 67, 68 

 of Teleostei, 228 

 of Tortoise, 240 

 of Vertebrata, 177, 196 

 Skin or integument, 194 ; of Mammals, 



250 

 Skull or cranium, 197 ; development and 



regions of, 198 

 Skull, Amphistylic, autostylic or proto- 



?tylic, hyostylic, 200 

 Skull of Birds, 240, 243 

 of Carnivore, 268 

 of Craniata, 198 

 of Cyclostomata, 216 

 of Pishes, 217, 220 (Skate, Dogfish) 

 of Piog, 234 

 of Rabbit, 252, 253 

 of Reptile?, 239 

 Sleeping sickness, Ct-use of, 42, 43 ; 



carrier of, 144, 154 

 Slow-worm (Anguis), 239 

 Snail. See Helix. 

 Snakes or Serpents (Ophidia), 239 

 Solenocytes. See Flame-cells. 

 Somatopleure, 15, 248 

 Spermatogenesis, 9 

 Spermatozoa, 9 

 Sphenodon, syn. Hatteria (New Zealand 



" lizard "), 239 

 Spinal cord, 200, 202 

 Spiracles, 207, 211 

 Spiral valve, 208, 238 (of conus) 

 Spirochaetes (Spirochaeta, etc.), 20, 23, 



46, 47, 155, 161 

 Splanchnocoele, 192, 196, 248 

 Splanchnopler.re, 15, 248 

 Spleen, 208 

 Sponges (Porifera), 18, 67 ; Ascon type 



of, 68, 69, 73 ; Sycon type of, 68, 71, 



72, 73 ; Classification of, 68 

 Spongilla (Freshwater Sponge), 68, 71, 74 

 Spore-formation, 12, 30, 48, 55 

 Sporoblast, 65 

 Sporocyst, 94 

 Sporogony, 60, 63 

 Sporozoa (Gregarines), 21, 23, 54-67 ; 



modes of infection, 60 fa 



Sporozoite, 58, 59, 61-65 

 Spotted Fever (Rocky Mountain), Cause 



of, 162 

 " Staggers " or " Sturdie," Cause of, 



100 



Starfish (Asterias), 164 

 Statoblasts, 71 

 Stegomyia (Mosquito of Yellow Fever), 



143, 148, (larva) 151 

 Stomodaeum, 15 



Stomoxys (Stable-fly), 144, 152, 153 

 Strongyloides, syn. Rhabdonefna, 111, 112 

 Sturgeon (Acipenser), 228 

 Substitution or replacement bones, i'H), 



234, 235 



Sub-zonal membrane. See False amnion. 

 Supra-renal or adrenal bodies, 208 

 " Surra," Cause of, 45, 143 

 Swim-bladder or air-bladder, 212, 218 

 Sycon (Orantia). See Sponges. 

 Syllia, 114, 122, 123 

 Symbiosis, 17, 30, 35, 36 

 Symbiotic algae, 30, 48, 77 , 

 Synapta, 164 

 Syndactylous toe&, 267 

 Syngamus (Gape-worm), 106 

 Syngamy, 8, 12 



Syphilis, Spirochaete of, 46 ; horse- 

 syphilis or dourine, 45 

 Syrinx, 241 



TABANIDAE, Chrysops, 110, 143 : Tabanue, 



45, 143 



Tadpole larva of Frog, 232 

 Taenia. See Tapeworms. 

 Taeniosis, Cau?e of, 90 

 Tail in Fishes, Forms of, 218 

 Tapeworms (Cestoda), 90, 95 

 Tapir, 264, 271 

 Tarsipes, 261, 267 

 Tarm-us, 264, 272, 273 



