CONTENTS. 315 



5. Orallas. Waders or Shore Birds ; Flamingo, Ostrich, Rail, Plover, &c. 6061 



6. Arueres. Web-footed Birds; Goose, Duck, Petrel, Cormorant, &c... 61 



SECT. IV. Class III. Reptiles. 



Peculiarities in the structure of Reptiles 61 flS 



Orders of Reptiles. 1. Chdonia. Tortoises 62 



2. Sauria. Lizards ; Crocodile, Chameleon, Dragon, Alligator, &c. . . . 62 68 



3. Ophidia. Serpents ; venomous and not venomous 63 64 



4. Batrackia. Frog, Toad, Salamander, Proteus, Siren, &c 64 65 



SECT, V. Class IV. Fishes. 



Peculiarities in the structure of Fishes 6567 



SECT. VI. Class V. Insects. 



Structure of insects. Dorsal vessel. Mode of respiration. Nervous sys- 

 tem, senses 67 



No internal skeleton, external covering 67 



Head of Insects, mouth and organs around it, jaws and mode of action .... 68 



Legs and wings of Insects. Abdomen 68 09 



Metamorphoses of Insects 60 



Three stages of existence Larva, Chrysalis, Perfect Insect TO 



Orders of Insects. 1. Coleoptera. Beetles, &c 71 



2. Hemiptera. Grasshopper, Cricket, &c 71 



3. Lepidoptera. Butterfly, Moth 71 



4. Jfeuroptcra. Dragon-fly, Ephemera, fcc 71 



5. Hymenoptera. Ant, Wasp, Bee, &c 72 



6. Diptera. House-fly, Gnat, Musquetoe, &c 72 



7. Jlptera. Millepedes, Flea, Louse, &c 1S| 



Family of the Arachnides or Spiders 73 



Their mode of transporting themselves through the air ; 78 



SECT. VII. Class VI. Crustacea. 



Resemblance in some points to insects 74 



Structure, shell, claws j singular structure of the stomach in some species 75 



SECT. VIII. Class VII. Mollusca. 



Destitute of bones and articulated limbs. Testaceous covering to many species 76 



Nervous systems, respiration, circulation, digestion ^. 77 



Orders of Mollusca 77 



Structure of the Cuttle-fish, their size 7778 



Ovster, Clam, &c. Organs of locomotion 79 



SECT. IX. Class VIII. Vermes or Worms. 



Btr u --I ure of Worms. Earth-worm, Leech, and Hair-worm 808 1 



