508 REPTILES, AMPHIBIANS AND FISHES 



Sea-horse, 377. 

 Sea-iguana, 33. 

 Sea-snakes, colour, 87. 



— distribution, 43. 



— structure, to6. 

 Sebastes norvegicus, 333, 337. 

 Sebastodes, 333, 337. 

 Selache, 284, 293. 



Sense-organs, dermal, of Amphibia, 159. 



— of fishes, 243, 390. 



— lateral line, 394, 395. 

 Serpent-heads, 299, 380. 



Sexual characters, of Amphibia, 228. 



— of fishes, 307, 308. 



— of reptiles, 62, 78. 



— of Urodela, 199. 

 Shad, American, 275. 



— breeding, 343. 



— migrations, 298. 

 Silurian, fishes of, 251. 

 Siluridas, evolution, 258. 



— intestinal respiration, 379. 



— stridulation, 408. 

 Siphonops annidatus, 207. 

 Siphonostoma, 331. 



Sipo, colour, 85. 

 Siren lacertina, 164. 

 Skates, electric organs, 432. 



— sexual characters, 308. 

 Skin, in fishes, 422. 

 Skins, colour, 75. 



— dermal bones, 118. 



— distribution, 41. 



— reproduction, 69. 



— structure, 115. 

 Sloughing of reptiles, 60. 

 Slow-worms, distribution, 41. 



— eyes, 116. 



— fracture of tail, 151. 



— reproduction, 69. 



— structure, 113. 

 Smelt, egg, 343. 

 Snakes, dentition, 144. 



— distribution, 42. 



— food, 48. 



— structure, in. 

 Snoek, 279, 281. 

 Soft-finned fishes, 258. 

 Sole, habitat, 275. 



— South African, 278. 

 Solenostoma, 331. 



Solomon Islands, Amphibia, 179. 

 Sooglossus sechellensis, 191. 

 South Africa, fishes, 279. 

 South America, Amphibia, 179. 



— fresh-water fishes, 267. 



— reptiles, 39. 

 Spade-footed toads, 225. 

 Spelevpes, 179. 



— fuscus, 205. 



— porphyyiticus, 22G. 



Spengel, J. W., on Enteropneusta, 492 

 Sphenodon, 18. 



— associations, 61. 



— food, 52. 



— spines, 118. 



— systematic position, 3. 

 Spij-slange, 148. 



Spinax niger, phosphorescence, 422. 

 Spiny-finned fishes, evolution, 259. 



— — luminous organs, 418. 

 Spiny-tailed lizards, 91. 

 Spiracle of dog-fish, 241. 



— of tadpoles, 211. 



Spiral valve of Elasmobranchs, 243. 



Spitting of snakes, 148. 



Sprat, eggs, 343. 



Squamata, 25, 27. 



Squeteague, voice, 392, 406. 



Stegocephali, 171. 



Stegosauria, dermal armour, 121, 122. 



Stellions, 41. 



Stereospondyli, 172. 



Sterlet, 265. 



Sternoptychidas, 287. 



— luminous organs, 425. 

 Slemoptyx diaphana, 413. 

 Sternum, in reptiles, 13. 

 Stickleback, nest, 326. 



— marine, nest, 327. 

 Stinkpot terrapin, odour, 645. 



— stridulation, 63. 

 Stockfish, 277. 

 Stomiatidae, 287. 



— luminous organs, 414, 415. 

 Stridulating organs, 408. 

 Stromateidae, 306. 

 Sturgeons, air-bladder, 383. 



— evolution, 257. 

 Stygicola, blindness, 401. 

 Surf-perches, 276. 

 Sun-fishes, 273. 

 Surinam toad, 167, 195. 

 Swallowing of young by viper, 73. 

 Symbranchus, 300. 

 Syngnathidae, 331. 

 Synodontidae, 412. 



Synodontis, 375. 



Synodus 288. 



Syrski, on male eel, 288. 



Tactile sense, fishes, 396. 

 Tadpole, of Amphibia, 186. 

 — ■ of Ascidians, 486. 

 Tarpons, evolution, 258. 



— habitat, 273. 

 Teeth in Amphibia, 180. 



— in reptiles, 138. 

 Teiidae, colour, 76, 85. 



— distribution, 41. 

 Teleosauridae, 120. 

 Teleostei, 258. 



