Manual of object-teaching by Calkins N

Author:Calkins, N[orman] A[llison], 1822-1895. [from old catalog]
Language: eng
Format: epub, pdf
Tags: Object-teaching. [from old catalog]
Publisher: New York, Harper & brothers
Published: 1882-03-25T05:00:00+00:00

CLASSIFICATION OF AXIMALS.

231

I. Mammalia

11. AvES (Birds).

CLASSES—VERTEBRATES.

The branch I. Vertebrata is divided into Jive classes, as follows :

Animals that have breathing organs

in the form of lungs; blood, warm ;

heart, four cavities; young produced

^ alive, and nursed by the mother; skin

usually has hair, either on a part or the

whole of the body, as man, monkey, bat,

quadrupeds, ivhale, sea-lion, dugong.

( Animals that have breathing organs

I in the form of lungs, but connected

■i with other air receptacles; blood, warm ;

heart, four cavities ; young hatched from

eggs ; skin covered with feathers.

Animals with breathing organs in the form of lungs; never breathe by gills; blood, cold; heart,usually three cavities; young usually produced from eggs; skin covered with scales or plates, as alli-^ gator, turtle, lizard, snake.

Animals with breathing organs, in the young, in the form of gills only, but in the full-formed animal in the form of lungs alone, or of lungs and gills; blood, cold; heart, in young, two cavities; in adult, three cavities ; young produced from eggs; skin usually naked and smooth, as frog, toad, tadpole, salainan-. der, newt, siredon.

Animals that have breathing organs in the form of gills ; blood, cold ; heart, V. Pisces (Fishes) . ■{ usually two cavities; young produced I from eggs; body generally covered with I scales, sometimes naked, as with eels.

III. Reptilia <

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