586 INDEX. 



Ampliibia continued. PAGE 



Blind-worms ........ 364 



Amphibia without gills 365 



An exception to the universality of metamorphoses . . 366 



Amphiumas ........ 366 



Gigantic salamander ....... 367 



The " Hell-bender " 367 



Amphibia with permanent gills 367 



Four genera known, Axolotus, Monobranchus, Proteus, 



and Siren 368 



Axolotle 368 



Snake-like proteus . . . . . . . 368 



Its curious branchial organs 368 



Mud-eel . . .369 



Batrachian amphibia ....... 370 



Their metamorphosis ...... 370 



Batrachia divisible into two sections . . . . 371 



Tailed batrachians 372 



Terrestrial salamander . ... . . 372 



Great warty newt ....... 373 



Smooth newt ........ 373 



Tailless batrachia 374 



Frogs . . . . . . . .375 



Curious arrangement of their tongue .... 375 



How distinguished from toads . . . . . 375 



Tree frogs 375 



Toads . . 376 



Pipas 



CHAPTER XXV. 



Serpents . .378 



First order of true Reptiles 378 



Their formidable attributes 378 



Water serpents . ....... 379 



Sea or pelagic serpents ...... 379 



Fresh-water snakes . . . . . . . 379 



Venomous serpents 379 



Their poison most potent . . . . .381 



Poison fangs 382 



Poison glands . . . . . . . 382 



Rattlesnakes 382 



Fer-de-lance ... .... 383 



Horned vipers ........ 383 



Viper 384 



Boas 385 



Boa-constrictor, teeth of 



Special contrivance to aid deglutition .... 387 



Anaconda ........ 387 



Harmless snakes 387 



Common ringed snakes 388 



Double walkers .... . , . . .388 



Lizards, their resemblance to serpents . . 



Saurians, their diverse habits ..... 390 



