CAE AEE) 
ELEMENTARY TERMS 
EMPLOYED IN ZOOLOGY. 
The science of animals was divided by Linneus into 
six branches, each according with one of his six classes. 
he 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. 
AVERTEBRAL, destitute of back-bones. 
VERVEBRAL animals are divided into 
1. QuapRUPEDs, the science of which has no popular 
name. It includes four footed animals; as ox, dog, 
mouse. 
2. Birps, the science of which is called ornithology. 
it includes the feathered tribe ; as pigeon, goose, wren. 
5. 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. Fisu, the science of which is called ichthyology. It 
includes all aquatic animals, which have gills and fins ; 
as shad, trout, sturgeon, eel. 
AVERPEBRAL animals are divided into 
5. Ixsecrs, 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, 
