First lesson in zoology : adapted for use in schools . Fio. 223.—Cats muzzle, with whiskers and naked skin about the nostrils. in roomy orbits; besides the upper and lower lid, there is,as in the birds, a nictitating membrane which rises from theinner angle of the eye, and can be drawn over the red portion lining the eyelids and corners of the eye iscalled the conjunctiva ; over the ball of the eye it is trans-parent and colorless. The pupil is the central part ofthe eye; it is surrounded by the iris, which varies muchin color and can contract in the light, or expand in dark-ness.
First lesson in zoology : adapted for use in schools . Fio. 223.—Cats muzzle, with whiskers and naked skin about the nostrils. in roomy orbits; besides the upper and lower lid, there is,as in the birds, a nictitating membrane which rises from theinner angle of the eye, and can be drawn over the red portion lining the eyelids and corners of the eye iscalled the conjunctiva ; over the ball of the eye it is trans-parent and colorless. The pupil is the central part ofthe eye; it is surrounded by the iris, which varies muchin color and can contract in the light, or expand in dark-ness. In a bright light the iris closes so as to leave only anarrow vertical chink. We thus see how perfectly the catseye is adapted to its habits of night prowling. In none of the backboned animals previously mentionedis there a well-formed outer ear; but that of the cat is large THE CAT AS A TTPE OF TEE MAMMALS. 219 and full, with its deep hollow directed forwards and Fig. 324.—TJnder-Burface of catsfore-paw. I, II, lU, IV, V, thefive toes, I being the poUex;a, trilobed pad which lies be-neath the distal ends of themetacarpal bones; *, pad be-neath the pisif orux bone of thewrist.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1894
