Page:Jardine Naturalist's Library Foreign Butterflies.djvu/55

Invertebrate Animals.	$\scriptstyle {\left\{{\begin{matrix}\ \\\\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \\\ \ \end{matrix}}\right.}$	I. Apathetic Animals.
		1. Infusoria.
		2. Polypes.
		3. Radiarii.
		4. Vermes.
		(Epizoaires.)
		II. Sentient Animals.
		5. Insecta.
		6. Arachnides.
		7. Crustacea.
		8. Annelides.
		9. Cirrhipedes.
		10. Mollusca.

Vertebrate Animals.	$\scriptstyle {\left\{{\begin{matrix}\ \\\\\ \\\ \\\ \\\ \\\ \ \end{matrix}}\right.}$	III. Intelligent Animals.
		11. Pisces.
		12. Reptilia.
		13. Aves.
		14. Mammiferæ.

The animals of the first primary division he defines as destitute of feeling, and moving only by their excited irritability; and he assigns as their character, the absence of a brain and of an elongate medullary mass; senses wanting; forms various; articulations rarely existing. The animals of the second division feel, but they obtain from their sensations only perceptions of objects, a kind of simple ideas which they are unable to combine with each other in order to form complex ones. They possess no vertebral column, but have a brain and most frequently an elongate medullary mass; some distinct senses; organs of motion attached under the