INDEX. 585 



PAGE 



Order of Apodal Soft-finned Fishes 344 



Their chief characteristic ...... 344 



Eels 344 



Their singular journeys ...... 345 



Conger eels 345 



Muraense 345 



Gymnoti 346 



Electric eel, its electric apparatus 346 



Order of Tuft-gilled Fishes 346 



Sea-horses (Hippocampi) 346 



Order of Fishes with conjoined Jaws (Plectognathi) . . 347 



Gymnpdonts . . . . . . . 347 



Jaws furnished with a species of beak .... 347 



Globe-fishes 348 



Why so called . . . . . . . .348 



Their curious structure 348 



Sun-fishes . . . . . . . ,348 



File-fishes 349 



Balistes . . .349 



Trunk-fishes . . 350 



Division of Cartilaginous Fishes ...... 350 



Sturgeons, their general form ... . . 350 



Caviar . . 351 



Spatularia * 351 



Chimseras ......... 352 



Cartilaginous fishes with fixed Branchiae . . . 352 



Order of Plagiostomes 352 



Sharks . . 352 



White sharks 354 



Greenland shark 354 



Sawfishes 355 



Skates 355 



Torpedos 356 



Order of Cyclostomes, or Circular-mouthed Chondroptery- 

 gians : 



The lamprey 356 



The sea lamprey 357 



The river lamprey 357 



The lampern 357 



The hag-fishes . . . ... . .358 



The ammocaetes 358 



CHAPTER XXIII. 



Reptiles . 358 



Admirably adapted to the duties imposed on them 



Characters of reptiles 



Eggs of reptiles 



Grouped under four principal sections . 



359 

 360 

 360 

 361 



CHAPTER XXIV. 



Amphibia ....*.... 362 



Mud-fish 363 



Footless amphibia 364 



