ELEMENTARY TERMS 



EMPLOYED IN ZOOLOGY. 



The science of animals was divided by Linneus into 

 six branches, each according with one of his six classes. 

 The French have prefixed a more general two-fold di- 

 vision. These divisions, however, are rather popular 

 than scientific. 



Animals are divided into 



VERTEBRAL, having back-bones. 



A VERTEBRAL, destitute of back-bones. 



VERTEBRAL animals are divided into 



1. QUADRUPEDS, the science of which has no popular 

 name. It includes four footed animals ; as ox, dog, 

 mouse. 



2. BIRDS, the science of which is called ornithology. 

 It includes the feathered tribe ; as pigeon, goose, wren. 



3. AMPHIBIOUS ANIMALS, the science of which is call- 

 ed amphibiology. It includes those cold-blooded animals, 

 which are capable of living on dry land or in the water $ 

 as tortoise, lizard, serpent, frog. 



4. FISH, the science of which is called ichthyology. It 

 includes all aquatic animals, which have gills and fins $ 

 as shad, trout, sturgeon, eel. 



AVERTEBRAL animals are divided into 



5. INSECTS, the science of which is called entomology 

 It includes all animals with jointed bodies, which have 

 jointed limbs ; as flies, spiders, lobsters. 



6. VERMES, the science of which is called helminthol- 

 ogy. It includes all soft animals of the avertebral divis- 

 ion, which have no jointed limbs, with or without hard 

 coverings ; as angle- worms, snails, oysters, polypi, in- 

 fusory animals. 



